For future reference and if I am not mistaken, here are the commands (some custom/third party) used in that video :

- "_importobj" (third party) to bring in a .obj control cage without subdivision. If it fails because of unsupported geo, subdividing the object once before import can bypass the issue.
- "_Subdiv_beta9" (also third party) to control the smoothness of subdivision
- "ImportSubD" (stock) to import a .obj with subdivision and reconstructed surfaces
- "pastepart" (stock) to place parts on surfaces.

For the third party import and subdivision scripts : https://moi3d.com/wiki/MaxScriptArchive

I hope this helps !