Actually, your editor would need to make sure a Section break is the last thing copied. You being able to identify them (quite easy if you switch to Draft View), doesn't help if your editor doesn't use them.

At a more basic level, though, why is your editor copying/pasting to another document - and without knowing how to do so properly? If you need to break the document into segments for editing, I'd suggest you make a number of copies, one for each segment, then simply delete whatever occurs before/after the desired segment for each document. Your editor should then work in the documents you supply and use Track Changes, so you can see exactly what is being changed.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]