Quad Chamfer Modifier Workflow
For the Quad Chamfer operations, I used a third party script called “Quad Chamfer Modifier“ from Marius Silaghi, which has very handy options that are not available in the default 3DS Max Chamfer modifier.
I also highly recommend the AKM tutorial by Tim Bergholz / Chamfer Zone
Now this workflow is very simple to understand. You define the polygons through smoothing groups and after applying the Quad Chamfer modifier it adds additional chamfering at the edges at which the smoothing groups meet. Then applying Turbosmooth with two to three subdivisions will result in a nice Highpoly.
Here is our mesh with predefined smoothing groups, ready to make use of the Quad Chamfer modifier.