Creating a cut line

Discussion created by Guest on Nov 25, 2005
I am working on making modl halves by subtracting my positive from a block and starting from there. On several occations I have needed to slice the block to break out islands and other details so they can be moved to the other half of the mold.
In the past I can been cutting using a surface, this works fine but I must make copies of the parts before I do as one side of the cut is discarded. So I cut two copies and re-combine the non-discarded halfs.
It would be much easier to be able to cut the solid at a surface and just delete the parts I don't want. Is there a way to break a solid or cut it? without one part being deleted?