As @pcrawley suggests some ilogic could make that easy for you. Here is a rule to expose the parameter in all sheetmetal parts.
This is untested so save work before running.
' Get the active assembly.
Dim asmDoc As AssemblyDocument = ThisApplication.ActiveDocument
' Get all of the referenced documents.
Dim refDocs As DocumentsEnumerator = asmDoc.AllReferencedDocuments
' Iterate through the list of documents.
For Each refDoc As Document In refDocs
Dim refDef As ComponentDefinition = refDoc.ComponentDefinition
If refDoc.IsModifiable = True _
AndAlso refDef.Type = ObjectTypeEnum.kSheetMetalComponentDefinitionObject Then
Dim thickness As Inventor.Parameter = refDef.Parameters.Item("Thickness")
If thickness.ExposedAsProperty = False Then
thickness.ExposedAsProperty = True
End If
End If
Next
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Regards
Alan