How to cut a 3D surface in 2 parts?

 From:  Frenchy Pilou (PILOU)
650.2 In reply to 650.1 
A very easy method :)
Draw a curve : extrude it by "Direction" through your object to cut (or place your template)
Select your Object : Trim it by the extruded curve previous
Kill the "extruded line"
Your have your object cuted in 2 parts :)
Valuable for any objects :)

Is beautiful that please without concept!
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EDITED: 3 Jun 2007 by PILOU