What the hell? Ok I'll try
1.Make a condition for the switch example
Bring exacly 1 any unit to location blah
Actions
Set switch 1
(if there is another switch b4 that)
clear switch 0
Next trigger Conditions
Switch 1 is set
actions
Create destroy blah blah blah
If you didnt get that well thats to bad but if you did i did something good for once