Any footnotes & endnotes you copy & paste between document will be renumbered to fit the sequence into which they're inserted in the destination document. That is unavoidable. If you have the numbering set to re-start with each Section or page (for footnotes) that may be acceptable. However, if you want continuous numbering, the only workaround would be to insert Section breaks either side of the pasted content and set an appropriate starting # for that section. Doing so, however, will mess up your footnote & endnote numbering for all subsequent content.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]