To change the value of a data area, use the Change Data Area (CHGDTAARA) command.
The CHGDTAARA command changes all or part of the value of a specified data area. It does not change any other attributes of the data area. The new value can be a constant or a CL variable. If the command is in a CL program or procedure, the data area does not need to exist when the program or procedure is created.