Thanks for your question.
So, as I understand it, you are wanting to select arbitrary meshes in Max (that are not already models in the game engine) and send that as a new VMF with new MDLs? If that is the case, see this document and video:
More info here:
https://dev.wallworm.com/document/218/convert_scene_to_model.html
So, as I understand it, you are wanting to select arbitrary meshes in Max (that are not already models in the game engine) and send that as a new VMF with new MDLs? If that is the case, see this document and video:
More info here:
https://dev.wallworm.com/document/218/convert_scene_to_model.html