Where can I find out the number damage a projectile does to an actor?

I am wondering where I need to look at which part configures the number of damage a projectile would do to an actor.
Basically, if this box has 100 health, where do I find how much damage the projectile is actually doing?
Or is this something that needs setup? Thanks!

If you are working in a template, I am not sure.

Generally though you have to create all this from scratch. The engine already has a few health and damage functions but it is up to you to organize them and getting them working off each other.