Have you tried inserting continuous Section breaks after the first section you want protecting, and before the second part that you want protecting. Then when you go into tools -> protect you can click on the "sections" button and select the sections you wish to protect (ie sections 1 and 3 will be protected?
Then just insert a word field and edit the default text to be whatever you wanted it to say?
Hopefully I have read your question right...
I have created a template for a letter in Word containing merge fields and have defined a data source. It works fine.
There are fields at the top of the letter and also at the bottom. Between these I want to allow insertion of "body text" in a document created from the template.
Is there any way of protecting the merge fields to prevent them being changed or edited and also allowing text to be inserted in the central area? Ideally, I would like a "label" - "please insert body text here" which disappears when anyone starts typing text.