Irregular cuts possible?

Hi! I was doing a section and with make2d and a cutting plane but now I realized that instead of doing a straight cut, it would be nice to do like a zickzack-cut. Is it possible in an easier way? One method would be to draw a line and make a physical cut (perhaps in a new model to not ruin the first) but I was thinking there might be an easier way?

If so please let me know!!

Hi Ameda - not in plain Rhino, but Dynamic Display has this tool.