RESTART Parameter in JCL :

RESTART parameter is coded in the JOB statement to restart the job from a particular step. When the Job is resubmitted it executes from the step mentioned in the RESTART parameter. RESTART step can be in JCL or PROC.

Example Job Statement with RESTART:

//TESTJOB JOB (9999),CLASS=A,MSGCLASS=X,NOTIFY=TESTUSER,RESTART=STEPNAME

If the RESTART step is in a PROC then

//TESTJOB JOB (9999),CLASS=A,MSGCLASS=X,NOTIFY=TESTUSER,RESTART=JOBSTEP.PROCSTEP