Compound Collision Shape Help

I have an object that is built from multiple blocks. At present, each block has its own rigid body control. I’d like to switch to a compound collision shape to improve performance, but a problem has arisen. When a projectile collides with an object, only the block that it hits should be removed and not the entire object. With rigid body controls, I can easily achieve the this task, but I am unsure of how to achieve it with a compound collision shape. Any recommendations? Any help is appreciated.