I would like to be able to lock or otherwise prevent modification to the first part of the first page of a WPTools document - basically the addressing, date and saluation part of a letter.
This first part will contain one of several pre-defined "templates", each of which contain address, salutation and some merge fields. I would also like to be able to exchange one template for another in an existing document that already has user added text.
What are some approaches I might try for this?