Allow only editing selected part of read-only document

You can set a document as read-only and still allow editing only for some selected parts.

Steps

To allow changes to selected parts

1. Click Restrict Editing in the Review tab.
2. In the Restrict Editing task pane, select the Allow only this type of editing in the document: Fill out a form check box.
3. Click Yes, Start Enforcing Protection.
4. In the Start Enforcing Protection dialog box, type password, and then click OK.
5. If another user open this document without knowing the password, changes to selected parts are only allowed.