When you merge two documents, any footnotes & endnotes are liable to have their numbering sequences merged, though you can then tell Word to change the way their numbering is handled, so as to restore their independence. As for citations, etc. If both sets use the same master list, there should be no problem. It's only when you've made modifications that introduce conflicts that there may be problems. Also, if either document uses references that aren't in the master list, the combined document will end up with both sets, as you'd want. The updated bibliography, though, will reflect what's in the combined document; it won't produce a separate list for each component.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]