How do I destroy only 1 of the same objects

The problem is when the global varible 'Crate Health' = 0 all crates are destroyed instead of only the one my bullet collided with. What I have is:

CrateHealth = 3

When Bullet collides with Crate: Subtract 1 from crate health

When Crate Health = 0: destroy crate

This destroys all the crates instead of only the one that got hit. What I am looking for is a way to destroy just the one without having to create multiple sprites.

Thanks

Hint: How can you have one variable that tracks health for all individual crates?

Codah's hinting to the instance variables, you can find them just above the 'behaviours' tab!

thankyou I have never actually used or understood instance variables before. Now I do