I have mine as sub-events.
Mouse -> On Left button Clicked
System -> [variable name] = 1 ..... here are events for that
Else
System -> [variable name] = 2 ..... here are events for that
Note, you do need the "Else" condition for the second sub-event and beyond. And to get to the variable name part, it's called Compare Variable after you select the System event.
Oh I didn't know about sub-events. Thanks for the help!