Smooth to Prevalent Smoothing Group
Works in face sub-object level of editable polygon base objects.
Assigns the prevalent smoothing group found within the current selection of faces to the entire selection of faces (removing any other smoothing groups).
Feel free to modify as you like.
Installation & usage:
1. Download attached .mcr file to your MacroScripts folder.
2. Run the script once from MAXScript -> Run Script...
3. Assign a keyboard shortcut through Customize -> Customize User Interface... -> Group: Main UI; Category: Megamorph -> Smooth to Prevalent Smoothing Group in Selection.