How do i check if there is

how do I check if there is (for example) 3 object1 col with zone1 (aka object2)

and how do i instead of doing += for var do = for how meny enemys

but this might make more sense

how meny of the same object is having col with the zone oject but that object has vars to tell u zone it is

Assuming you mean 3 different object1 colliding with zone1, make a variable for zone1 to count how many object1 is in it:
first, an event that set objectCount to 0,
then a For Each event that checks if object1 is colliding with zone1, add 1 to that variable

it wont WORK
ive tried it

also so this might make more sense to how meny of the same object is having col with the zone oject but that object has vars to tell u zone it is