Bus model's

Hey i am playing arround making some mods for the game and have ran in to a little problem.
I would like to start on a project on making some new bus models for the game , like the Volvo B10M , but i cant seam to finde enything on how to import the created mesh to the editor enywere or what file format the 3d model has to be?
Eny of you guy’s out there that can help me ? would be greatly appreciated

The 3d program i am using is 3DS Max 2015

You should be exporting them in the fbx file format. It’s a straightforward export from 3DS Max.

Good luck !