Many Thanx to all!

Mauro's method is very well, but I have a problem with export to IGS.
I have made a simple test: two sphere cut and blend, its surfaces was join, solid done. I made export to IGS and open in PROE. Images attached. What I made wrong?

Moi3D solid export to IGS:



IGS import in PROE:



The handle in PROE: