How do I auto number word docs like invoice numbers

[Avi Baer]

Is there any easy way to have a doc say Purchase-Order, then each time the
doc is accessed then a number goes into the doc number field, then when the
doc saves, it saves it with the number like P-ORDER-xxxxxxx

 

[garfield-n-odie]

See http://word.mvps.org/FAQs/MacrosVBA/NumberDocs.htm .