Change a field link to an unlinked field
In rare circumstances you may want to change a field link to a plain, unlinked field. In other words, you want to break the link, but keep the field reference. The only way to do this is to delete the link and re-insert a field link that has the exact characteristics you want.
You can easily change a field into text, which breaks all ties between the field and the Page Properties dialog box, other field links, and other inserted fields.