diff --git a/src/components/collections/TransformReferencesDialog.jsx b/src/components/collections/TransformReferencesDialog.jsx
new file mode 100644
index 00000000..8016bf4e
--- /dev/null
+++ b/src/components/collections/TransformReferencesDialog.jsx
@@ -0,0 +1,101 @@
+import React from 'react'
+import { useTranslation } from 'react-i18next'
+import Dialog from '@mui/material/Dialog'
+import DialogTitle from '@mui/material/DialogTitle'
+import DialogContent from '@mui/material/DialogContent'
+import DialogActions from '@mui/material/DialogActions'
+import Button from '@mui/material/Button'
+import Typography from '@mui/material/Typography'
+import CircularProgress from '@mui/material/CircularProgress'
+import Box from '@mui/material/Box'
+import Chip from '@mui/material/Chip'
+import Table from '@mui/material/Table'
+import TableBody from '@mui/material/TableBody'
+import TableCell from '@mui/material/TableCell'
+import TableContainer from '@mui/material/TableContainer'
+import TableHead from '@mui/material/TableHead'
+import TableRow from '@mui/material/TableRow'
+import Alert from '@mui/material/Alert'
+import { getTransformPreviewItems } from './referenceTransformUtils'
+
+const expressionSx = {
+  fontFamily: 'monospace',
+  fontSize: '12px',
+  overflowWrap: 'anywhere',
+  maxWidth: '260px',
+}
+
+const TransformReferencesDialog = ({ open, onClose, onConfirm, references, loading }) => {
+  const { t } = useTranslation()
+  const previewItems = React.useMemo(() => getTransformPreviewItems(references), [references])
+  const eligibleItems = previewItems.filter(item => item.eligible)
+  const skippedItems = previewItems.filter(item => !item.eligible)
+  const selectedCount = references?.length || 0
+
+  return (
+    <Dialog open={open} onClose={loading ? undefined : onClose} maxWidth='md' fullWidth>
+      <DialogTitle>
+        {t('reference.transform_confirm_title', { count: selectedCount })}
+      </DialogTitle>
+      <DialogContent sx={{display: 'flex', flexDirection: 'column', gap: 1.5}}>
+        <Typography variant='body2' color='text.secondary'>
+          {t('reference.transform_confirm_body')}
+        </Typography>
+
+        <Box sx={{display: 'flex', gap: 1, flexWrap: 'wrap'}}>
+          <Chip size='small' color='primary' label={`${selectedCount} ${t('common.selected')}`} />
+          <Chip size='small' color='success' label={`${eligibleItems.length} ${t('common.eligible')}`} />
+          <Chip size='small' color={skippedItems.length ? 'warning' : 'default'} label={`${skippedItems.length} ${t('common.skipped')}`} />
+        </Box>
+
+        {eligibleItems.length === 0 && (
+          <Alert severity='warning'>
+            {t('reference.transform_no_eligible')}
+          </Alert>
+        )}
+
+        <TableContainer sx={{border: '1px solid rgba(0,0,0,0.12)', borderRadius: '4px', maxHeight: '420px'}}>
+          <Table stickyHeader size='small'>
+            <TableHead>
+              <TableRow>
+                <TableCell>{t('reference.expression')}</TableCell>
+                <TableCell>{t('reference.new_expression')}</TableCell>
+                <TableCell>{t('common.status')}</TableCell>
+              </TableRow>
+            </TableHead>
+            <TableBody>
+              {previewItems.map(item => (
+                <TableRow key={item.reference?.id || item.reference?.expression}>
+                  <TableCell sx={expressionSx}>{item.reference?.expression}</TableCell>
+                  <TableCell sx={expressionSx}>{item.proposedExpression || '-'}</TableCell>
+                  <TableCell>
+                    {item.eligible ? (
+                      <Chip size='small' color='success' label={t('common.eligible')} />
+                    ) : (
+                      <Chip size='small' color='warning' label={t(item.reasonKey)} />
+                    )}
+                  </TableCell>
+                </TableRow>
+              ))}
+            </TableBody>
+          </Table>
+        </TableContainer>
+      </DialogContent>
+      <DialogActions>
+        <Button onClick={onClose} variant='text' disabled={loading}>
+          {t('common.cancel')}
+        </Button>
+        <Button
+          onClick={() => onConfirm(eligibleItems)}
+          variant='contained'
+          disabled={loading || eligibleItems.length === 0}
+          startIcon={loading ? <CircularProgress size={16} color='inherit' /> : null}
+        >
+          {t('reference.transform_references')}
+        </Button>
+      </DialogActions>
+    </Dialog>
+  )
+}
+
+export default TransformReferencesDialog
diff --git a/src/components/collections/referenceTransformUtils.js b/src/components/collections/referenceTransformUtils.js
new file mode 100644
index 00000000..124982c2
--- /dev/null
+++ b/src/components/collections/referenceTransformUtils.js
@@ -0,0 +1,97 @@
+const RESOURCE_SEGMENTS = ['concepts', 'mappings']
+const REPO_SEGMENTS = ['sources', 'collections']
+
+const hasRepoPin = reference => Boolean(reference?.version && String(reference.version).toUpperCase() !== 'HEAD')
+
+const hasResourcePin = reference => Boolean(reference?.resource_version)
+
+const splitExpression = expression => {
+  const parts = String(expression || '').split('?')
+  return {
+    path: parts[0],
+    query: parts.length > 1 ? parts.slice(1).join('?') : '',
+  }
+}
+
+const getRelativePathParts = path => {
+  const match = String(path || '').match(/^(.*?)(\/(?:orgs|users)\/.*)$/)
+  if(!match)
+    return null
+
+  return {
+    prefix: match[1],
+    parts: match[2].split('/').filter(Boolean),
+  }
+}
+
+export const buildNonVersionedReferenceExpression = reference => {
+  const expression = reference?.expression
+  if(!expression)
+    return null
+
+  const { path, query } = splitExpression(expression)
+  const parsed = getRelativePathParts(path)
+  if(!parsed)
+    return null
+  if(parsed.prefix)
+    return null
+
+  const parts = [...parsed.parts]
+  const repoTypeIndex = parts.findIndex(part => REPO_SEGMENTS.includes(part))
+  if(repoTypeIndex === -1)
+    return null
+
+  const afterRepoIndex = repoTypeIndex + 2
+  if(hasRepoPin(reference) && parts[afterRepoIndex] && !RESOURCE_SEGMENTS.includes(parts[afterRepoIndex]))
+    parts.splice(afterRepoIndex, 1)
+
+  const resourceTypeIndex = parts.findIndex(part => RESOURCE_SEGMENTS.includes(part))
+  const resourceVersionIndex = resourceTypeIndex + 2
+  if(hasResourcePin(reference) && resourceTypeIndex !== -1 && parts[resourceVersionIndex])
+    parts.splice(resourceVersionIndex, 1)
+
+  const proposedPath = `${parsed.prefix}/${parts.join('/')}/`
+  return query ? `${proposedPath}?${query}` : proposedPath
+}
+
+export const getReferenceTransformPreview = reference => {
+  if(!reference?.id)
+    return { reference, eligible: false, reasonKey: 'reference.unsupported_transform' }
+
+  if(!hasRepoPin(reference) && !hasResourcePin(reference))
+    return { reference, eligible: false, reasonKey: 'reference.already_non_versioned' }
+
+  const proposedExpression = buildNonVersionedReferenceExpression(reference)
+  if(!proposedExpression || proposedExpression === reference.expression)
+    return { reference, eligible: false, reasonKey: 'reference.unsupported_transform' }
+
+  return {
+    reference,
+    eligible: true,
+    proposedExpression,
+  }
+}
+
+export const getTransformPreviewItems = references => (references || []).map(getReferenceTransformPreview)
+
+export const getTransformAddGroups = previewItems => {
+  const groups = {}
+  previewItems.filter(item => item.eligible).forEach(item => {
+    const reference = item.reference
+    const include = reference.include !== false
+    const key = JSON.stringify({
+      reference_type: reference.reference_type,
+      include,
+      cascade: reference.cascade || null,
+    })
+    if(!groups[key]) {
+      groups[key] = {
+        include,
+        cascade: reference.cascade || null,
+        items: [],
+      }
+    }
+    groups[key].items.push(item)
+  })
+  return Object.values(groups)
+}
diff --git a/src/components/search/Search.jsx b/src/components/search/Search.jsx
index 327d8797..25e44101 100644
--- a/src/components/search/Search.jsx
+++ b/src/components/search/Search.jsx
@@ -6,9 +6,15 @@ import Tabs from '@mui/material/Tabs';
 import Tab from '@mui/material/Tab';
 import Button from '@mui/material/Button';
 import Tooltip from '@mui/material/Tooltip';
+import Menu from '@mui/material/Menu';
+import MenuItem from '@mui/material/MenuItem';
+import ListItemIcon from '@mui/material/ListItemIcon';
+import ListItemText from '@mui/material/ListItemText';
 import OrgIcon from '@mui/icons-material/AccountBalance';
 import UserIcon from '@mui/icons-material/Person';
 import DeleteForeverIcon from '@mui/icons-material/DeleteForever';
+import TransformIcon from '@mui/icons-material/Transform';
+import DownIcon from '@mui/icons-material/KeyboardArrowDown';
 import { forEach, keys, pickBy, isEmpty, find, uniq, has, orderBy as sortBy, uniqBy, omit, max, isEqual, isBoolean } from 'lodash';
 import { COLORS } from '../../common/colors';
 import { dropVersion, highlightTexts, isLoggedIn } from '../../common/utils';
@@ -22,6 +28,8 @@ import { OperationsContext } from '../app/LayoutContext';
 import ReferenceFilters from '../repos/ReferenceFilters'
 import DeleteReferencesDialog from '../collections/DeleteReferencesDialog'
 import RemoveFromCollectionDialog from '../collections/RemoveFromCollectionDialog'
+import TransformReferencesDialog from '../collections/TransformReferencesDialog'
+import { getTransformAddGroups } from '../collections/referenceTransformUtils'
 import RemoveCircleOutlineIcon from '@mui/icons-material/RemoveCircleOutline'
 
 const DEFAULT_LIMIT = 25;
@@ -57,6 +65,9 @@ const Search = props => {
   const [isMatchOp, setIsMatchOp] = React.useState(false)
   const [deleteReferencesOpen, setDeleteReferencesOpen] = React.useState(false)
   const [deletingReferences, setDeletingReferences] = React.useState(false)
+  const [referenceActionsAnchor, setReferenceActionsAnchor] = React.useState(null)
+  const [transformReferencesOpen, setTransformReferencesOpen] = React.useState(false)
+  const [transformingReferences, setTransformingReferences] = React.useState(false)
   const [bulkRemoveOpen, setBulkRemoveOpen] = React.useState(false)
   const [bulkRemoving, setBulkRemoving] = React.useState(false)
 
@@ -462,6 +473,71 @@ const Search = props => {
     })
   }
 
+  const addTransformedReferences = group => {
+    const data = {
+      expressions: group.items.map(item => item.proposedExpression),
+      include: group.include,
+    }
+    const body = { data }
+    if(group.cascade) {
+      data.cascade = group.cascade
+      body.cascade = typeof group.cascade === 'string' ? group.cascade : group.cascade?.method || ''
+    }
+
+    return APIService.new().overrideURL(collectionUrl).appendToUrl('references/').put(body)
+  }
+
+  const getAddedTransformItems = (response, group) => {
+    if(![200, 201].includes(response?.status))
+      return []
+    if(!Array.isArray(response?.data))
+      return group.items
+
+    const addedExpressions = response.data.filter(item => item.added).map(item => item.expression)
+    return group.items.filter(item => addedExpressions.includes(item.proposedExpression))
+  }
+
+  const onTransformReferences = async transformItems => {
+    const groups = getTransformAddGroups(transformItems)
+    setTransformingReferences(true)
+
+    const addResults = await Promise.all(groups.map(group => addTransformedReferences(group).then(response => ({ group, response }))))
+    const addedItems = addResults.reduce((items, { group, response }) => [...items, ...getAddedTransformItems(response, group)], [])
+    const addFailures = addResults.reduce((count, { group, response }) => count + group.items.length - getAddedTransformItems(response, group).length, 0)
+
+    if(!addedItems.length) {
+      setTransformingReferences(false)
+      setAlert({ severity: 'error', message: t('reference.transform_no_references_changed') })
+      return
+    }
+
+    const deleteResponse = await APIService.new()
+      .overrideURL(collectionUrl)
+      .appendToUrl('references/')
+      .delete({ ids: addedItems.map(item => item.reference.id).filter(Boolean) })
+
+    setTransformingReferences(false)
+    const deleteSucceeded = [200, 204].includes(deleteResponse?.status)
+    if(deleteSucceeded) {
+      setTransformReferencesOpen(false)
+      setSelected([])
+      const transformedCount = addedItems.length
+      setAlert({
+        severity: addFailures ? 'warning' : 'success',
+        message: addFailures ?
+          t('reference.transform_partial_success', { transformed: transformedCount, failed: addFailures }) :
+          t('reference.transform_success', { count: transformedCount }),
+      })
+      fetchResults(getQueryParams(input, page, pageSize, filters, orderBy, order))
+    } else {
+      setAlert({
+        severity: 'warning',
+        message: t('reference.transform_delete_failed', { count: addedItems.length }),
+      })
+      fetchResults(getQueryParams(input, page, pageSize, filters, orderBy, order))
+    }
+  }
+
   const selectedRows = (result[resource]?.results || []).filter(r => selected.includes(r.version_url || r.url || r.id))
 
   const onBulkRemoveFromCollection = deleteBody => {
@@ -493,19 +569,20 @@ const Search = props => {
     </Button>
   ) : null
 
-  const deleteReferencesControl = resource === 'references' && isLoggedIn() && selected.length > 0 ? (
+  const closeReferenceActions = () => setReferenceActionsAnchor(null)
+
+  const referenceActionsControl = resource === 'references' && isLoggedIn() && selected.length > 0 ? (
     <Tooltip title={!isHead ? t('reference.not_available_in_version') : ''}>
       <span>
         <Button
-          startIcon={<DeleteForeverIcon fontSize='inherit' />}
+          endIcon={<DownIcon fontSize='inherit' />}
           variant='contained'
           size='small'
-          color='error'
           disabled={!isHead}
           sx={{textTransform: 'none', whiteSpace: 'nowrap', borderRadius: '8px', marginLeft: '8px'}}
-          onClick={() => setDeleteReferencesOpen(true)}
+          onClick={event => setReferenceActionsAnchor(event.currentTarget)}
         >
-          {t('reference.remove_selected')}
+          {t('reference.actions')}
         </Button>
       </span>
     </Tooltip>
@@ -589,7 +666,7 @@ const Search = props => {
                   properties={props.properties}
                   propertyFilters={props.propertyFilters}
                   isMatch={isMatchOp}
-                  toolbarControl={deleteReferencesControl}
+                  toolbarControl={referenceActionsControl}
                   extraBulkActions={bulkRemoveFromCollectionAction}
                 />
               </div>
@@ -606,6 +683,41 @@ const Search = props => {
             }
           </div>
       }
+      <Menu
+        anchorEl={referenceActionsAnchor}
+        open={Boolean(referenceActionsAnchor)}
+        onClose={closeReferenceActions}
+      >
+        <MenuItem
+          onClick={() => {
+            closeReferenceActions()
+            setTransformReferencesOpen(true)
+          }}
+        >
+          <ListItemIcon>
+            <TransformIcon fontSize='small' />
+          </ListItemIcon>
+          <ListItemText>{t('reference.transform_to_non_versioned')}</ListItemText>
+        </MenuItem>
+        <MenuItem
+          onClick={() => {
+            closeReferenceActions()
+            setDeleteReferencesOpen(true)
+          }}
+        >
+          <ListItemIcon>
+            <DeleteForeverIcon fontSize='small' color='error' />
+          </ListItemIcon>
+          <ListItemText>{t('common.remove')}</ListItemText>
+        </MenuItem>
+      </Menu>
+      <TransformReferencesDialog
+        open={transformReferencesOpen}
+        onClose={() => setTransformReferencesOpen(false)}
+        onConfirm={onTransformReferences}
+        references={selectedReferenceObjects}
+        loading={transformingReferences}
+      />
       <DeleteReferencesDialog
         open={deleteReferencesOpen}
         onClose={() => setDeleteReferencesOpen(false)}
diff --git a/src/i18n/locales/en/translations.json b/src/i18n/locales/en/translations.json
index da6e2220..9e6a5299 100644
--- a/src/i18n/locales/en/translations.json
+++ b/src/i18n/locales/en/translations.json
@@ -52,6 +52,10 @@
     "view_all_attributes": "View all attributes",
     "all": "All",
     "actions": "Actions",
+    "selected": "selected",
+    "eligible": "eligible",
+    "skipped": "skipped",
+    "status": "Status",
     "metadata": "Metadata",
     "details": "Details",
     "copied_to_clipboard": "Copied to clipboard",
@@ -286,6 +290,19 @@
     "remove_confirm_body_selected": "This will remove the selected reference(s) from the collection expansion.",
     "not_available_in_version": "Not available in saved versions. Switch to HEAD to edit.",
     "remove_success": "References removed successfully.",
+    "actions": "Actions",
+    "transform_to_non_versioned": "Transform to non-versioned reference",
+    "transform_confirm_title": "Transform {{count}} reference(s)?",
+    "transform_confirm_body": "This will add non-versioned replacement references first, then remove the old pinned references after the add succeeds.",
+    "transform_references": "Transform references",
+    "transform_success": "{{count}} reference(s) transformed successfully.",
+    "transform_partial_success": "{{transformed}} reference(s) transformed. {{failed}} reference(s) could not be transformed and were left unchanged.",
+    "transform_no_eligible": "None of the selected references can be transformed to non-versioned references.",
+    "transform_no_references_changed": "No references were transformed.",
+    "transform_delete_failed": "{{count}} non-versioned reference(s) were added, but the old pinned references could not be removed. Refresh and review the references list for duplicates.",
+    "already_non_versioned": "Already non-versioned",
+    "unsupported_transform": "Unsupported",
+    "new_expression": "New Expression",
     "brought_in_by": "Brought into collection by",
     "brought_in_by_tooltip": "This {{resource}} appears in this collection expansion as a result of these references.",
     "no_references_found": "No references found.",
diff --git a/src/i18n/locales/es/translations.json b/src/i18n/locales/es/translations.json
index 075df0f5..27dc1e86 100644
--- a/src/i18n/locales/es/translations.json
+++ b/src/i18n/locales/es/translations.json
@@ -24,6 +24,10 @@
     "about": "Acerca de",
     "view_all_attributes": "Ver todos los atributos",
     "actions": "Acciones",
+    "selected": "seleccionados",
+    "eligible": "elegibles",
+    "skipped": "omitidos",
+    "status": "Estado",
     "metadata": "Metadatos",
     "copied_to_clipboard": "Copiado al portapapeles",
     "navigate": "Navegar",
@@ -102,6 +106,22 @@
     "website": "Sitio web",
     "last_login": "Último inicio de sesión"
   },
+  "reference": {
+    "actions": "Acciones",
+    "expression": "Expresión",
+    "new_expression": "Nueva expresión",
+    "transform_to_non_versioned": "Transformar a referencia sin versión",
+    "transform_confirm_title": "¿Transformar {{count}} referencia(s)?",
+    "transform_confirm_body": "Esto agregará primero referencias de reemplazo sin versión y luego eliminará las referencias fijadas anteriores cuando la adición se complete correctamente.",
+    "transform_references": "Transformar referencias",
+    "transform_success": "{{count}} referencia(s) transformada(s) correctamente.",
+    "transform_partial_success": "{{transformed}} referencia(s) transformada(s). {{failed}} referencia(s) no pudieron transformarse y se dejaron sin cambios.",
+    "transform_no_eligible": "Ninguna de las referencias seleccionadas puede transformarse en una referencia sin versión.",
+    "transform_no_references_changed": "No se transformó ninguna referencia.",
+    "transform_delete_failed": "Se agregaron {{count}} referencia(s) sin versión, pero no se pudieron eliminar las referencias fijadas anteriores. Actualiza y revisa la lista de referencias para detectar duplicados.",
+    "already_non_versioned": "Ya está sin versión",
+    "unsupported_transform": "No compatible"
+  },
   "search": {
     "filters": "Filtros",
     "concepts": "Conceptos",
diff --git a/src/i18n/locales/zh/translations.json b/src/i18n/locales/zh/translations.json
index e4b5a350..c27bef47 100644
--- a/src/i18n/locales/zh/translations.json
+++ b/src/i18n/locales/zh/translations.json
@@ -41,6 +41,10 @@
     "view_all_attributes": "查看全部属性",
     "all": "全部",
     "actions": "操作",
+    "selected": "已选择",
+    "eligible": "可处理",
+    "skipped": "已跳过",
+    "status": "状态",
     "metadata": "元数据",
     "copied_to_clipboard": "已复制到粘贴板",
     "navigate": "导航",
@@ -289,6 +293,20 @@
     "recent_activity": "最近的活动"
   },
   "reference": {
+    "actions": "操作",
+    "expression": "表达式",
+    "new_expression": "新表达式",
+    "transform_to_non_versioned": "转换为非版本化引用",
+    "transform_confirm_title": "要转换 {{count}} 个引用吗？",
+    "transform_confirm_body": "系统会先添加非版本化的替代引用，添加成功后再移除原来的固定版本引用。",
+    "transform_references": "转换引用",
+    "transform_success": "已成功转换 {{count}} 个引用。",
+    "transform_partial_success": "已转换 {{transformed}} 个引用。{{failed}} 个引用无法转换，已保持不变。",
+    "transform_no_eligible": "所选引用中没有可以转换为非版本化引用的项目。",
+    "transform_no_references_changed": "没有转换任何引用。",
+    "transform_delete_failed": "已添加 {{count}} 个非版本化引用，但无法移除原来的固定版本引用。请刷新并检查引用列表中是否有重复项。",
+    "already_non_versioned": "已经是非版本化",
+    "unsupported_transform": "不支持",
     "cascade": "级联",
     "source_mappings": "源映射",
     "all_source_concepts_and_mappings": "所有源概念和映射",