A simple trick that is often used in more complex JCL scripts, is to submit a job from a job. z/OS has a facility for this called the Internal Reader. The name Internal Reader stems from the old days when physical devices where used to read input in punch cards. These physical devices where called (external) readers. The Internal Reader is a logical device operating functionally, but virtually, like the physical device from the old days.

Anyway, this is the JCL.

//SUBJOB EXEC PGM=IEBGENER
//SYSIN DD DUMMY
//SYSPRINT DD DUMMY
//SYSUT1 DD DSN=DATASET.NAME.JCL(NEXTJOB),DISP=SHR
//SYSUT2 DD SYSOUT=(A,INTRDR)

With this JCL you copy the JCL script in dataset DATASET.NAME.JCL(NEXTJOB) to the internal reader, which fundamentally submit the content as a job.