Document.IsSubdocument Property (Word)
True if the specified document is a subdocument of a master document. Read-only Boolean.
Syntax
expression .IsSubdocument
expression A variable that represents a Document object.
Example
This example determines whether Sales.doc is a subdocument and then displays a message indicating the status of Sales.doc.
If Documents("Sales.doc").IsSubdocument = True Then
MsgBox "Sales.doc is a subdocument."
Else
MsgBox "Sales.doc is not a subdocument."
End If