How would you make two more more holes that you could go though?

Making one hole in a union that you can walk through works fine, though if I try to make to or more, only one I would be able to walk into without stopping.

I'm not sure what the best way is, but you could make a rough circle with parts, and make it invisible. Then get the union part and make CanCollide = false. That way it works as a hole, but looks the way you would like it too.