Nurbs solids

 From:  Michael (SPLEEVE)
45.1 
First of all Michael nice work!
I come from a nurbs solids modler created by the team at Electric Image.
Unfortunatly it was discontinued a while back and I have been looking for a replacement ever since.
The question I have - not being in the least technical - is, in the EI Modeler when you cut or trim with a curve the cut objects are still solids. ie if a sphere is cut in half the two halves are not hollow. The only time I can get this with Moi is when using booleans.
Is there a way to do this in Moi so that the cut face remains solid? or is there an easy way to fill that cut when it is not a planer loop?
Hope this is clear.
Mike.