If you bookmark a change, you can use a PAGEREF field (which can be created via Insert|Cross-References) to output the page # on which the bookmarked range first appears. If you later add pages, simply use Ctrl-A then F9, to update the cross-references (and other fields).

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]

thanks very much, using PAGEREF to reference theo bookmarks as their page numbers did the job