The secret! ;)

You can't add points to several surfaces in the same time!
So you must copy one surface with its adding points made! As shown in my previous video! :)

Else for general case for deform a complex volume...by face...don't move the perimeter's points !


For the complex volume above the rectangular surface it's just the Flow function! :)

http://moi3d.com/4.0/docs/moi_command_reference8.htm#flow

You can take any surface as start base! Planar or not!
so a rectangular, circular as a disc, a bump etc...
Better if you take something like your base object! Take the copy of the bottom object can be also cool!

You can also take a simple line like following...