Hi Paolo,
first, my apologies, I have to learn that there are people on this forum that haven't experienced
3d modelling software before, it must be very confusing at first but keep using Moi you will get the
hang of it and will benefit in the long run.
Just to give you an uderstanding on where I'm coming from.
At work we use a 'high end' 3d modelling package and when I want to make a surface I must decide between,

Swoop
4 point surface
studio surface 1x1
studio surface 1x2
studio surface 2x0
studio surface 2x2
studio surface nxn
Ruled
Through Curve
Through Curve Mesh
Swept
Styled Sweep
n sided surface

when I started using MoI and seeing just those 3 surface commands and actually achieving the same
type of complex shapes as the 'high end' product I thought this is brilliant, and if I ever met Michael I
would give him a Hug............in a masculine way of course :)

Cheers
Danny