In gma1 it can be done by multipatch, but in gma2 you can't really do that directly. Not yet anyhow.
Multipart fixtures can be done, but those parts cannot share the same address.
Another way is to have special model with multiple beams (just like blinder models), but that does not allow separate focusing, therefore 2 light blinder could be done, but acl bar would be static.
There is no simple solution without downsides for that on gma2 yet.