Split polysurface into halves

I want to split the any given polysurface into halves using a plane in grasshopper. I am new to this software.
My main aim is to get contours only on outside and only 180 degrees. This is for cutting tool path for milling.

final.gh (15.6 KB)


@Toliakuldeep1998, you need to internalise your data, in your case into the mesh geometry component, before posting your file here. Otherwise, nobody is going to be able to inspect your geometry.

What does internalise data mean?

See point 3 in the link below.