Multiple Envelopes -- Creating

I work in a law firm. I have several cases that have multiple envelopes that I print EVERY single time I write one document. For example, a letter -- which goes to five different people. It gets REALLY time consuming to have to go to Outlook and print the envelopes, having to search for each name, or even to search for the list. In WP, which I have used for many, many years, I had a document for each case set up called, ENVELOPES. I could open that one document, hit print, and every envelope I needed would print.

How do I do this in Word? I tried to append to document more than one envelope, and Word (I'm using Word 2002) simply replaces the first envelope with the new information. This is what I mean:

Clerk
Client
Opposing Counsel #1
Opposing Counsel #2

I would like a document with envelopes set up, with the bar code and all, for these four folks. How do I do this in Word?