In export definitions, you can select one-to-one and one-to-many export fields. A one-to-one export field contains one value in your database. For example, Birth date is a one-to-one export field because constituents have one birth date. A one-to-many export field contains several values in your database. For example, Email address is one-to-many because constituents can have multiple email addresses.
When you select a one-to-many field on the New Export Definition screen, the Export criteria screen appears. On this screen, you can select the number to export and define how the export sorts and filters the fields.
Note: When you select fields from Address Processing, the behavior is different. For information about address processing, see Export Definitions Address Processing.