Hi,
I will try.
Isn't it simply creating 2 GLOBAL variables such as Cooldown_1 and Cooldown_2
because I imagine you want your combo attacks to require fast pressing of a specific instance
Then you can say on press #1 you do your attack and also set Cooldown_1 to say 0.5 seconds
Then if Cooldown_1 = 0.5s action Wait 0.5s and set Cooldown_1 = 0
Then on press #2 AND IF Cooldown_1 = 0.5s then do your 2nd attack and set Cooldown_2 to 0.5s
Then if Cooldown_2 = 0.5s action Wait 0.5s and set Cooldown_2 = 0
Then on press #3 AND IF Cooldown_2 = 0.5s then do your 3rd attack
There you go