For labels and letters only, there is a
Label/Letter type
field. Your selection in this field determines for whom the letter or label can be generated, and it also determines the set of fields that are available for selection from the Fields pane when you design the label or letter. The choices are Client, Contact, Firm, Office, and Staff. For example, if you are creating a letter to be mailed to clients, select Client. If you want to create labels for mailings to your standalone contacts, select Contact.