Thanks! That is one option that i am considering. Since we are already live, i am trying to explore other options as well.
As mentioned, i have setup the EO_INBOUND_PARALLEL_SENDER in PI SXMB_ADM.
With this i should be able to direct all messages from particular sender system to one queue.
However, i am looking at if i can make a query per interface via SXMB_ADM parameters.
Appreciate all your responses till now.