Large Word documents are often sprinkled with references to information throughout a document. You can enter them manually, but they'll be hard to maintain later. Instead, use this simple technique.

How to Update All Cross-References at Once in Word 2007. When you are creating a lengthy, laborious business file such as a contract or other legal document, using the cross-reference feature in ...

Word can't break in to them to add text, but this doesn't mean you've got to settle with how they appear on the Word page. Use Word's text boxes to layer your documents, adding text to scanned files.