Hi,
that's quite simple to do:
have an array with all your platforms for that group ( it's like a radio button UI system basically).
-- in your fsm, you'll have an FsmInt called "Current Platform", and that index represent the current platform moving.
-- then you pick a random int within the range of the array, and call that platform for this random int
-- when the platform has finished it calls this fsm ( because it knows who sent the event to actuall move using "get event info" action), and then your fsm can pick another one
Bye,
Jean