It is quite a long and computer taxing process taking a model from max and importing it into UnrealEd.

It is possible to import .obj files into UnrealEd but it wont thank you for it. I have a converter that will allow you to save your models as a UnrealEd "brush" which creates .t3d files.

After that its just a matter of alot of waiting while your brush is imported/exported, moved and built. God forgive you if you click "build all" and dont really mean it.