Granting another group profile

I need to grant a group profile for some software.  I have a short CL 
Program to receive the list of users with a parm for the group profile I 
wish to add.  In the CL I'm first trying to add a supgrpprf and if there is 
no group profile it will then add the parm as the group profile.  This 
works fine if the user already has a group profile and no supgrpprf.  But 
if there is already one of each, then the original supgrpprf will be 
replaced by the parm.  Is there a way to add a group profile instead of 
overwriting the original one?

For those interested, I have pasted my CLPGM - I'm no programmer by the way.
Thanks for any help,
Chris Whisonant




/*  GRANT GROUP PROFILE */

            PGM        PARM(&USER)

              DCLF       FILE(MYLIB/GRPLIST)
              DCL        VAR(&USER) TYPE(*CHAR) LEN(8)
              MONMSG     MSGID(CPF0000)

/*  RECEIVE FILE GRPLIST AND GRANT GROUP PROFILE  */

GETREC:
              RCVF

              MONMSG     MSGID(CPF0864) EXEC(GOTO CMDLBL(ENDOFFILE))
              MONMSG     MSGID(CPF4101 CPF0860 CPF4131) EXEC(GOTO +
                           CMDLBL(EXIT))

              CHGUSRPRF  USRPRF(&GRPLIST) SUPGRPPRF(&USER)

              MONMSG     MSGID(CPD22B2 CPF22CD) EXEC(GOTO +
                                  CMDLBL(ADDGRPPRF))

              GOTO       CMDLBL(GETREC)

ADDGRPPRF:

              CHGUSRPRF  USRPRF(&GRPLIST) GRPPRF(&USER)

              GOTO       CMDLBL(GETREC)

ENDOFFILE:

EXIT:

              ENDPGM                                          

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