If your revised numbering is achieved via the 'Include Chapter number' option, it would be easy enough to use a macro to apply that to all captions. Other than that, a Find/Replace operation might be able to be used on the captions (attach a sample document to a post if you'd like me to see if I can work something out along those lines). The changes don't need to be applied to the cross-references as updating them will automatically apply the new format.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]