C# Surface.Trim Method

I am trying to split the surface with surface.trim method. I tried got the points on U and V direction and want to trim the surface at that location. result shall be similar to first image.
I am bit confused with surface domain and Interval class relation.

attached script and images

List<Surface> sfs = new List<Surface>();
for(int i = 0; i < U + 1; i++)
  //GH_Path gp = new GH_Path(i);
  for(int j = 0; j < V + 1; j++)
   Interval iU = new Interval(x.Domain(0).Length / U * i, x.Domain(1).Length / V * j);
    Interval iV = new Interval(x.Domain(0).Length / V * j, x.Domain(1).Length / U * i);
    //Interval iU = new Interval(????????
    //Interval iV = new Interval(???????
    Surface s = x.Trim(iU, iV);
A = sfs;

This is desired(surface is splited with gh native component surface split.

and this is my scripts outout


close, but some mistakes:

subdDiv.gh (7.3 KB)

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