INREC OVERLAY=(61:21,11,SFF,ADD,41,11,SFF,TO=PD,LENGTH=5)
  SORT FIELDS=(61,5,PD,A)
  OUTREC OVERLAY=(61:61,5,PD,EDIT=(SIII,IIT.TT),SIGNS=(+,-))

This example illustrates how you can use the OVERLAY parameter with INREC and OUTREC to change certain columns in your records without affecting other columns.

Positions 61-65 of the reformatted input records are overlaid with a 5-byte PD value derived from adding the sddd,ddd.dd field at positions 21-31 to the sddd,ddd.dd field at positions 41-51. The records are then sorted by this 5-byte PD field. Positions 61-71 of the reformatted output records are overlaid with an sddd,ddd.dd field derived from the 5-byte PD value. The data before positions 61-71 and after positions 61-71 are not affected