Crystal Reports for Rational Application Developer Designer Guide
Functions to duplicate group fields
Use these functions whenever you want to duplicate a group field in a formula.
Note: In order to use these functions, you must have already entered a group field in your report with identical parameters to those you plan to reproduce in the formula. For example, the same field, same sort-and-group-by field, same date/Boolean condition (if applicable), or same action (average, count).