In this example, the UNIT value for all the DDDEF entries is to be changed to 3350, regardless of its current value. Additionally, a UNIT subentry of 3350 will be added to all DDDEF entries which contain a DATASET subentry but do not currently have a UNIT subentry. The following ZONEEDIT command makes this change:

SET        BDY (TZONE1)      /* Set to zone to edit.    */.
ZONEEDIT   DDDEF            /* Edit DDDEF entries.      */.
CHANGE     UNIT(*,3350)     /* Change unit to 3350 and  */.
                            /* add UNIT if none exists. */.
ENDZONEEDIT                 /* End of ZONEEDIT.         */.