My document is 120 pages total, but I don't want pages 91-120 to have any
page numbering. And, I want the page numbering on 1-90 to say Page X of 90,
and to automatically update if I roll to 91 or 92 pages. Right now, the only
way I know how to do this is to manually type in the number of pages. Is it
possible to do this automatically?