Model Import
From Hash, Inc. WIKI
[edit] Importing a model
A:M's splines are in most cases superior to triangles or straight polygons. However, trying to import a polygon-based model poses its own challenges.
[edit] 3DS
(Source) If you have 3ds MAX, Import it into there first, highlight the whole model and right click - convert to - editable poly.
Then go to Geometry and select quadrify all.
Export as an .obj and select Quads in the exporter
Import in to A:M and while you'll have to fix parts it shouldn't need anywhere near as much as it would if you'd imported a .3ds made of triangles.