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However, there is more than one way to skin a cat. I can think of two alternatives off the top of my head."JCL symbols and system symbols can represent parameters, subparameters, or values in procedures or in the parameter field of statements; those that vary each time a job runs are good candidates to be coded as symbols."
- z/OS V1R4.0 MVS JCL Reference
//SETVAR01 SET NUM='01'
...
//ACTUALDD DD DDNAME=LABEL&NUM
//LABEL01 DD ...
//LABEL02 DD ...
//LABEL03 DD ...
...
//SETVAR1 SET VALUE1='SYSOUT=*'
//SETVAR2 SET VALUE2='DSN=OLD.DATA.SET,DISP=OLD'
...
//FIRSTDD DD &VALUE1
//SECONDDD DD &VALUE2
//FIRSTDD DD SYSOUT=*
//SECONDDD DD DSN=OLD.DATA.SET,DISP=OLD