GSS doesn't have an IF statement like other products but system symbols can be used in the GSS run parameters. Here is one way of selecting a member using symbols:
If the system name is "SYSA" then the ISETSYSA member would be included in this example.
SYMBOLS Enable or disable system symbol substitution. IBM's ASASYMBM
service is called for each RUNPARM member record and system
symbols. Use the z/OS console command "D SYMBOLS" for a
list of available symbols. The &SYSNAME symbols is the most
common used symbol.
Syntax Use this format for the SYMBOLS parameter:
ON Enables system Symbol substitution for CA-GSS/IServe
OFF Disables system Symbol substitution for CA-GSS/IServe
Here is an example of the SYMBOLS RUNPARM parameter:
ISET TSTIMOD DSN SYS2.GSS.&SYSNAME..GSST.TSTIMOD
Although it shows "SYMBOLS OFF", the recommendation is just putting "SYMBOLS ON" at the start of the GSS run parms and not bother turning it off.
Only system symbols are available. There are no GSS specific symbols at this point.