OK. Add the following to the ThisDocument module of the document
Code:
Option Explicit
Private Sub Document_ContentControlOnExit(ByVal ContentControl As ContentControl, Cancel As Boolean)
If ContentControl.Title = "Issue Date" Then
If Not ContentControl.Range.Text = ContentControl.PlaceholderText Then
ActiveDocument.SelectContentControlsByTitle("Expiry Date").Item(1).Range.Text = _
DateAdd("m", 12, CDate(ContentControl.Range.Text))
End If
End If
End Sub
Save the document as a macro enabled template and create new documents from it. As you tab out of the first date field the second one reflects 12 added months.