Microsoft Word Expert Needed

I own a small consulting firm that primarily works with nonprofit organizations on their major gift efforts. Depending on their particular need, let's say capital campaigns, I have more than 25 different documents that will be used over the course of our contract. At the present time I need to edit each document with the client name and name of the campaign and possibly other info. My question is can these documents be "Linked" so that if I make changes in one document they automatically show up in all 25? I have several service areas with numerous documents for each where this kind of linking would be quite time consuming. Appreciate your time and thoughts. PS. If linking is not the proper technique and there is one, what is it and where can I go to review it? Thanks again,