Sub Main()

    If Not ThisApplication.ActiveDocument.DocumentType = DocumentTypeEnum.kDrawingDocumentObject Then

        Messagebox.Show("Current document is not drawing docuemnt", "Inventor")

        Exit Sub

    End If

    Dim value_List As List(Of String) = New List(Of String)

    value_List.Add(iProperties.Value("Project", "Vendor"))

    value_List.Add( iProperties.Value("Project", "Stock Number"))

    value_List.Add(iProperties.Value("Project", "Project"))

    value_List.Add(iProperties.Value("Project", "Designer"))

    Dim oDoc As Document

    oDoc = ThisDrawing.ModelDocument

    If oDoc.DocumentType = DocumentTypeEnum.kAssemblyDocumentObject Then

        Update_Properties(oDoc, value_List)

        Dim oAsyDoc As AssemblyDocument

        oAsyDoc = oDoc

        Dim oReferDoc As Document

        Dim occ As ComponentOccurrence

        Dim oDef As AssemblyComponentDefinition

        oDef = oAsyDoc.ComponentDefinition

        For Each occ In oDef.Occurrences             

            If occ.SubOccurrences.Count = 0 Then

                oReferDoc = occ.ReferencedDocumentDescriptor.ReferencedDocument

                Update_Properties(oReferDoc, value_List)

            Else                

                oReferDoc = occ.ReferencedDocumentDescriptor.ReferencedDocument

                Update_Properties(oReferDoc, value_List)

                processAllSubOcc(occ, value_List)

            End If                

        Next

    Else If oDoc.DocumentType = DocumentTypeEnum.kPartDocumentObject Then

        Update_Properties(oDoc, value_List)

    End If

End Sub

Private Sub processAllSubOcc(ByVal oCompOcc As ComponentOccurrence , value_List As List(Of String))

    Dim oSubCompOcc As ComponentOccurrence

    Dim oReferDoc As Document

    For Each oSubCompOcc In oCompOcc.SubOccurrences

        If oSubCompOcc.SubOccurrences.Count = 0 Then

            oReferDoc = oSubCompOcc.ReferencedDocumentDescriptor.ReferencedDocument

            Update_Properties(oReferDoc,value_List)            

        Else

            oReferDoc = oSubCompOcc.ReferencedDocumentDescriptor.ReferencedDocument

            Update_Properties(oReferDoc ,value_List)            

            Call processAllSubOcc(oSubCompOcc, value_List)

        End If

    Next

End Sub

Sub Update_Properties(oDoc As Document, value_List As List(Of String))

    oDoc.PropertySets.Item("Design Tracking Properties").Item("Vendor").Value = value_List.Item(0)

    oDoc.PropertySets.Item("Design Tracking Properties").Item("Stock Number").Value = value_List.Item(1)

    oDoc.PropertySets.Item("Design Tracking Properties").Item("Project").Value = value_List.Item(2)

    oDoc.PropertySets.Item("Design Tracking Properties").Item("Designer").Value = value_List.Item(3)    

    oDoc.Save()

End Sub