You can use the SUM control statement to sum records. However, you can sum records for output by changing the record in the output area and then, if you want, by deleting the record leaving DFSORT. DFSORT returns to your routine with the address of a new record leaving DFSORT, and the same record remains in the output area, so that you can continue summing. If you do not delete the record leaving DFSORT, that record is added to the output area, and its address replaces the address of the previous record in the output area. DFSORT returns with the address of a new record leaving DFSORT.