Once you’ve got your Word merge document just the way you want it, by all means save it as a template so that you can use it with future merges. If your labels or letters will stay the same, you can then simply add a different data file by choosing Select Recipients in the Start Mail Merge group of the Mailings tab, selecting the new data file, and adding it to the Word document. Save the file as a template by clicking the File tab, choosing Save As, selecting a location, and choosing Word Template (*.dotx) in the Save as Type field of the Save As dialog box. When you’re ready to use the template next time, you’ll find it by clicking the Personal tab in the Start experience or the New screen. Simple.