I have some troubles on setting up assign tickets owner on SDP.

Requester A (site A) send out an incident template which will assign the ticket in round robin method.

I have setup some business rules on this to hope i can assign to the correct technicians but failed.

business rule example: subject= "A", placed in group "A", but still round robin the request to the technician who are not in group A. 

My perfect scenario: 

Requester A (site A) incident template submitted, ticket assign to technician Group B (site B)

Requester B (site B) incident template submitted, ticket assign to technician Group C (site c)

How can I do it?