I believe the feature should be available. At 7.5 it's under Devices -> <sensor name> -> Setup -> Advanced -> Port Clusters.
I don't have that exact model in my local lab to confirm quickly, but the feature is available on both my 1250 and m8000, so I'd expect it to be an available feature.
When i configuration port cluster that make ports down so i must remove it. or i do something wrong? Need somethings before config (ports up and running or first config and then plug cable...)? Thanks Gfergus!