You can combine the various documents via INCLUDETEXT fields, or just their headings for a Table of Contents via RD fields. Neither of these precludes the source documents having their own Tables of Contents. Obviously, though, if you want to change the heading levels, that needs to be done in the source documents, though it is possible to do this from the destination document in the case of links maintained via INCLUDETEXT fields.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]