Range.PreviousSubdocument (Word)

Mueve el intervalo al subdocumento anterior.

Si no existe otro subdocumento, se produce un error.

If ActiveDocument.Subdocuments.Count >= 1 Then 
 ActiveDocument.ActiveWindow.View.Type = wdMasterView 
 Selection.EndKey Unit:=wdStory, Extend:=wdMove 
 Selection.PreviousSubdocument 
End If