🚀 go-pugleaf

(I know that this question is off-topic but I do not know in which newsgroup
to post-it)
I have a JCL question: Is it possible to reset the RC system variable in a
JCL ? for example, with a statement like:
// SET RC=0
Obviously this statement does not work as RC it is not a normal "variable"

The goal is to have a JCL like the following:

//S1 EXEC PGM=P1
...
//  IF (RC GE 8) THEN   <--- start of the "does not work" construction
//   SET RC=4                 <--- does not work the idea is to "reset" the
RC variable to 4
// ENDIF                          <--- end of the "does not work"
construction

// IF (RC GE 4) THEN  <--- want to test with RC = 4 even if S1 ended with
RC=8
//S2 EXEC PGM=P2
...
// ENDIF

This JCL is generated via FTINCL statements from a REXX/ISPF proc and has a
(quite large) variable number of steps after the step S2. The idea is to
avoid to have to generate very complex IF/THEN/ENDIF construction for the
steps that follow S2 (for example by qualifying each test of RC with the
step name...)

Any idea?

Many thanks in advance