No collide

Is there any way to make a specific object not collide with another specific object?
I want to have invisible boxes placed on a character that can detect if they get hit by something, such as a bullet. That way each box sends a different message so the character knows where they got hit. So far I got everything to work, the boxes are children to the character and send a specific message when they’re hit by a bullet. My problem is, it seems that the boxes also collide with the character and he can’t move because he bumps into them. So is there any way to make the character not collide with them?
Or can someone point me in the right direction to doing this in a different way? Thanks.

hope it helps.

Exactly what I needed. Thank you!