Hide/Show lines.Hide Intersect Lines of Objects.
Mirror Objects by 1 click.
Paint Material to Face in Group,Component.Detele Material in Object.Replace Material.Rotate,Move,Align texture.Reverse Face.Get area of material.
Slice,Cut,Detach objects-Set plane by 2 points, 3 points or by Object-Add section faces.Create Group Section.
Make Stair,Ramp from Faces
Weld Edges to Curves.