@ Specktech Thanks! :)
Here the thread about subdivision inside MOI : https://moi3d.com/forum/index.php?webtag=MOI&msg=9689.1

The funny things is that you need only 5 tools sSplit, sBridge, sScale, Extrude, sSubdividBeta9 for make SUbdivision inside Moi!
But sufficient for cool little objects directly Nurbs!

Sure that is some rustic against dedicated prog like the free Rocket3F but... (who has a direct Bridge in the 2 ways with MOI) https://rocket3f.com




Always for the fun...I have found something free Online between Blender & Tinkercad ! :)
Figuro Designer! :) (polymodeler of light subdivision)
https://www.figuro.io/Designer