See http://word.mvps.org/FAQs/MacrosVBA/NumberDocs.htm
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Suzanne S. Barnhill
Microsoft MVP (Word)

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Words into Type
Fairhope, Alabama USA
Word MVP FAQ site: http://www.word.mvps.org
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> I have created a printable form in word, but I need a
> header that includes a serial number for each form. The
> first time it is printed it should have abc001 then the
> next would have abc002 etc. Is there any way to do this
> automatically so that the user does not have to update the
> document themselves?