Hi
Please check in the maintainence view of Table GB01 if Business Place (BSEG-BUPLA) and Section Code (BSEG-SECCO) are allowed as a field for substitution. You can check this in SM30.
Once you have these fields maintained as shown, these will now be available as fields which can be substituted.
Than write a substitution rule as under:
You can create a Set to maintain the t codes for which want this substitution to trigger. This is done in T Code GS01. The set ZTCODE in above rule looks like below:
Let me know if you need any further inputs
Regards
Sanil Bhandari