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In this tutorial, I will show you a modeling tip I have been taught by a talented colleague (Ron Frölich) some years ago.
You all know the turbosmooth modifier in 3DsMax, by using it with support edge loops on top of your mesh you can create nice highpoly assets.
The problem is once you have added those support edge loops, they can be a pain to deal with if you want to change the shape of your mesh.

There is an alternative to the regular usage of the turbosmooth modifier. You can use smoothing groups.

As exemple, see the cube above. On the right side, this is the regular usage of turbosmooth by using support edge loops.
On the left, each face has a different smoothing group. I tick in 'smoothing group' in the turbosmooth modifier and rise the value up to 6 then I add a regular turbosmooth on top of the first one.

Here the same technique applied on a more complex object. Each color represents a smoothing group.

This workflow is fast to use, easy to tweak. But be careful, it is performance consuming for your PC.