If you call the Table.Rows.Add method and you don't supply a value for
the optional BeforeRow parameter, the new row will be added after the
last row.

To prove it to yourself, run this code in a document that contains at
least one table:

Sub Test()
   Dim nRow As Row
   With ActiveDocument.Tables(1)
       Set nRow = .Rows.Add
       If nRow.Index <> .Rows.Count Then
           MsgBox "Not the last row"
       End If
   End With
End Sub

--
Regards,
Jay Freedman
Microsoft Word MVP        FAQ: http://word.mvps.org
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