MS Works? or MS Word?

In Word I routinely use Mail Merge for this task, putting the information into an Excel spreadsheet. It is pulled from that for a number of documents, not necessarily prepared at the same time.

People generally thing of mail merge for a bulk mailing. This is sort of the converse -- using one record for many documents. It works well for me. Getting started is a bit of a chore.

Once you have the information in your datafile, you perform the merge by selecting a single record for the merge rather than the entire set of records.

I started doing this using Word 3 for the Mac quite a while ago. It has been more than ten years since I've used a Mac, though.