Trying to add physics to my 3DS Max FBX

I recently imported a 3DS max file into unity with roughly 200 boxes in it that are supposed to act as the colliders for it. My question is, how do I add box colliders to them all or a mesh collider without having to go through each individual box and adding one. I don’t want to have to do this 200 times for this one alone and another 1000 times for future imports.

nevermind. i figured it out. I just needed to collapse all my objects together so they could be edited as a single unit.