So would you suggest making a plane for instance that splits the piece and doing a boolean operation?

Hello everyone, I have a father who is using Mastercam x9 and he has a 3d object/surface imported from solidworks. He wants to split the object in half but it is not a regular polyhedron, is there an easy way to split an object or adding an edge loop around an object. We tried the under Surface "Split face" but that did not seem to work. Does he just have to manually add edges around the object or is there an automated way to intelligently create that edge loop. I know next to nothing about Mastercam so I am not even sure if I am articulated the question very well. I do know a little 3d from blender for instance, in that software you can create an edge loop around an object and then split the object in half, is there some sort of equivalent functionality in Mastercam. Any help would be greatly appreciated, thank you!