Viewing the Predefined Fields list
The Predefined Fields tab of the Field Names dialog box simply allows you to view the complete list of preset field names. If you wish to add or edit your own field names you may do so by clicking the User-Defined Fields tab.
Using Fields in Business Card Infinity
The purpose of predefined fields is to allow you to design labels and cards by using fields that represent a type of text rather than specific text data. This saves a lot of work when using one particular template or design for multiple uses. For example, it's much easier to enter [DisplayName] and [BusinessAddress] once and let a Data Source fill in the details when you print than to type a specific person's name and address for each different label that you want to print. By adding one of the Field Names to your design you are simply adding a place holder that will be automatically replaced rather than typing in specific text that would need to be manually changed each time you changed the contents of a label or card.