How would I take a smaller part of a large static mesh

I imported a .obj file and I only want a small part of it.
Also the collision “area” is very big, is there any way to change it?

(You can probably tell I’m very new.)

-select the specific part in your 3d program - export just the small part of it (e.g in blender you can choose “selected only”)
-or disable “combine meshes” in the import settings

Collision -> how have you done the collision? :slight_smile:

Thank you! I will try those methods.