subject: AutoCAD DWG Import Dialog [print this page] Often, because of their placement on various AutoCAD layers, shapes imported into MAX may need to be edited. Attaching or detaching shapes is a very common technique to produce logical compound shapes. Familiarize yourself with MAX Sub-Object editing methods, especially those on how to attach and detach 2D splines to create compound shapes in 3D program (free 3d model).