Hi,
Do you mean during editing? that's not possible, Playmaker only runs its FSM during runtime.
if you only need to set global var, that's perfectly possible.
1: have one gameObject with on fsm "manager".
2: implement a global event "SET SOMETHING" or something
3: fill in event data if you need to pass more values with it
4: from the various places, instead of setting that global var, fire this event with the value you want to store,
5: this Fsm "manager" will receive that global event, extract the value you passed, and set that global variable himself.
then you have your reusable "behavior" that you can call from anywhere.
this is VERY good practice to build such systems, simply because if you perform the same thing in different places, it make sense to refactor and have one entity responsible for it, easier to debug, easier to maintain, and easier to further develop.
bye,
Jean