How do I make certain parts of a mesh hide in runtime

I’ve been trying to research ways on how to make certain parts of mesh get hidden for a long time and haven’t had any results. What i’m talking about is like how you can shoot actual holes in walls in Rainbow Six. Is it like having a box in the scene that doesn’t render anything inside of it or something? Please help and t. hanccs.

actualy you could achieve holes in objects by using a stencil shader. have a look for this on the web. but i guess there are other methods to use for holes. hiding some parts of a mesh i’d say is more difficult have a look at vertices: