See the "More complex letterhead" section of
http://sbarnhill.mvps.org/WordFAQs/Letterhead.htm

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Suzanne S. Barnhill
Microsoft MVP (Word)
Words into Type
Fairhope, Alabama USA
Word MVP FAQ site: http://word.mvps.org
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> Is there any way to flow text into a document so that no matter where page 2
> begins, the margins will change there for the remainder of the document. The
> idea is that if the writer adds or removes text from page 1, the margin
> change will adjust to the new page break position automatically. This would
> operate analogously to different header/footer on first page.