[otrs] Involving externals with own Ticketsystem

Dear all, We want to handle 3rd party companies doing services for us. Our needs are 1) separate communication from endcustomer 2) overview of all tickets handeled by 3rd party company 3) send full content of ticket including attachements to their ticket system 4) get back ticksystem # from 3rd party system My idea was: - use the "Split" function; this would solve 1) and 2) but not 3) - using a combination of "split", change "owner" and "forward" would solve 1), 2) and 3) but is very complicated in handling Does anybody have a good idead how to solve this. How does the rest of the world handle this process? Best Wolfgang