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You don’t have to take up space in your document for details like title, author, or date. Here’s how to add and customize headers and footers in Word.
If you run into a conditional header or footer request that you can't handle, take a look at Word fields. They're not magic, but it kind of feels like magic when they do what you want.
Use Word's StyleRef field to repeat content throughout a document, including in the header and footer.