You are saying that neither you nor anyone else has ever submitted a job with a sort step. . .In My System There is No such SORT Exist
I find this unbelievable. . .
Someone at sometime has submitted jcl that includes a sort. . .
When you locate one of these, clone it and use it for this exercise. . . Remember - ANY existing sort jcl can be used for this process. There is NO "extra" jcl for substring.