patch Multi-Beam fixtures - still puzzled when & why the question to "split?" appears or not

[axell]

When I have a fixture (i.e. Hybrid Spot/Washer Moving Head) and I want to control the Spot and Wash colors and dimming independently from each other. It says the fixture has 2 Beams but when I patch I am NOT getting the "Split-Question". What is the "trigger" to get this message or how should the fixture be configured in Profile Builder?
(I also edited the fixture so the Colors, Gobos, etc for the Spot COB and all Move (Pan/Tilt) respond to Beam 1 only, and all Wash colors respond to Beam 2 only - also assigned the Dimmer for the Spot on Beam 1 and the Dimmer for the Wash on Beam 2)

[Simon]

For a fixture to be split, the channels linked to each beam must be concurrent.

For example, this is ok:
beam 1 = channel 1+2
beam 2 = channel 3 + 4

This is not ok:
beam 1 = channel 1+3
beam 2 = channel 2+4

[axell]

YES! Your answer was the "Holy Grail" / 1 Mio. $" question about "fixture splitting" I never figured out. Thanks for explanation!

[axell]

However .... What I still don't understand is how I can configure a Multi Beam fixture to split, when the first channels only address Beam 1, the following addresses Beam 2 and now Strobe and/or Dimmer are unified controls and therefor assigned for both Beams (1+2). It will not split. If I configure Strobe & Dimmer just for Beam 2, it will split, but then Beam 1 will not respond correctly to Strobe and Dimmer (of his split Group) any more. So how can I configure a Multi Beam fixture to split, when it has "unified" control (i.e. Dimmer or Strobe)?