diff --git a/Types/AST/Alias.psd1 b/Types/AST/Alias.psd1
new file mode 100644
index 000000000..073f4cdd4
--- /dev/null
+++ b/Types/AST/Alias.psd1
@@ -0,0 +1,3 @@
+@{
+    "GetCollectionAndIndex" = "GetRelativeIndex"
+}
\ No newline at end of file
diff --git a/Types/AST/GetRelativeIndex.ps1 b/Types/AST/GetRelativeIndex.ps1
new file mode 100644
index 000000000..de606d38c
--- /dev/null
+++ b/Types/AST/GetRelativeIndex.ps1
@@ -0,0 +1,22 @@
+
+$thisCollection,$thisIndex = $null,-1     
+:FindThisIndex foreach ($parentProperty in $this.Parent.psobject.Properties) {
+    if ($parentProperty -is [PSScriptProperty] -or $parentProperty -is [PSNoteProperty]) {
+        continue FindThisIndex
+    }
+    $currentProperty = $this.Parent.($parentProperty.Name)
+    if (-not $currentProperty.IndexOf) { continue }
+
+    
+    if ($currentProperty.IndexOf($this) -ge 0) {
+        $thisCollection = $currentProperty
+        $thisIndex = $thisCollection.IndexOf($this)
+        break FindThisIndex
+    }
+
+}
+
+return ([PSCustomObject][Ordered]@{
+    Collection = $thisCollection
+    Index = $thisIndex
+})
\ No newline at end of file