Dear Naveen,
The multilevel cat for service request (incidents) use 2 parameters:
-SUBJECT_PROFILE: This is the parameter that you are passing.
-TXN_TYPE_AND_CATALOGTYPE: This is the pending parameter, please fill with the transaction type and catalog type that you customize @ Multilevel Categorization->Assign Transaction Types to Catalog Categories , You can use C or D catalog type but I recommend use C.
Regards,
David Faustini