Hi, I have one funnel and two buttons in my map. The first (floor) button turn on and off the funnel and the second (stand) button toggles the direction of the funnel.
Important : let say the funnel is blue and you remove a cube from the first button, then the funnel turns off. You press the other button and nothing happens, but when you re-place the cube onto the first button the funnel must be orange now...

I successfully created the toggling mec with a logic_branch connected to itself but I can't figure out how to add the powering button.

Any idea on how to do it ?

I uploaded a VMF that does exactly what you want.

The trick is: The Tractor Beam's direction can be changed while it is disabled. So you just need to enable and disable it with the floor button and change its direction with the logic_branch, ToggleTest with the stand button.

Thanks, I thought disabling it would make it disappear... Simpler than I expected.