Add the following code to the template
Code:
Option Explicit
Sub AutoNew()
Dialogs(wdDialogMailMergeSetDocumentType).Show
If ActiveDocument.MailMerge.MainDocumentType = wdNotAMergeDocument Then
MsgBox "No a merge document!"
GoTo lbl_Exit
End If
Dialogs(wdDialogMailMergeOpenDataSource).Show
Dialogs(wdDialogMailMergeRecipients).Show
lbl_Exit:
Exit Sub
End Sub
Then create a new document from it.