Good evening Dinesh.
Indicators A, B, etc refer to a spliting profile, which is then assigned to the specific plant. I do not have access to a system rigjt now so as to give you either the corresponding transaction or the corresponding SPRO path, but i am sure you can easily find it very closely to the SPRO point you are now. Maybe another forum participant can guide you better than what i have done.
Best regards
Nikos