There are various ways of doing this, including inserting Section breaks either side of page 10, unliking the footers for that page and page 11 from the previous Section, then modifying the page 10 footer. Another option might be to control the content via field coding. Without more details, though, we can't say what the best approach is for your situation.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]