To see how to do this and just about everything else you might want to do with dates in Word, check out my Microsoft Word Date Calculation Tutorial, at:
http://lounge.windowssecrets.com/ind...owtopic=249902
or
http://www.gmayor.com/downloads.htm#Third_party
In particular, look at the item titled 'Calculate a day, date, month and year, using n months delay'. Do read the document's introductory material.