Food4Rhino

RefitSplit for Rhino 8 split Surface and result is  UntrimSurface.

This  C# Script  Component trim Surface by multi Curves and change isosurface  of Trimed Surface based  on Trim Curves  Like Refit Spilt Cammand  In Rhino8  but you can split  Surface by several Curves by This grasshopper script. But in Rhino, you can only divide the surface with a curve