Hi Bruno,

re:
> Is it possible to blend curves in Moi ? ?

Yup, select your curves and then run the Construct > Blend command.

One of the differences between MoI and Rhino is that MoI doesn't have separate commands for doing things to curves and surfaces, there's just one Blend command and it will do either a curve blend or a surface blend depending on what you have selected.

- Michael