Hello guys, I’m new to this great application, so be patient with my questions. I’m using Modo 301 as my main 3D application and then import all my geometry into Unity. I want to know if it’s possible to use a low poly version of a high poly mesh as collision. This way it would optimize the scene by not using the high poly itself as a collision. If so, what I need to do in order to “link” the imported collision mesh to the high poly mesh?
That’s certainly possible. Just drag the mesh you want to use into the Mesh slot of a Mesh Collider component (adding the Mesh Collider if it doesn’t already exist). Simple as that. 
Thanks a lot NCarter. That is what I’m liking about Unity besides everything else, its simplicity!!