Dynamo - Create multiple surfaces from grid

How can i get multiple surfaces from my grid?
I created a surface with the contour lines and tried to cut it with the Geometry.split node but it did no work. Got any idea?

Keep your lines groups by U and V directions.

Extrude the lines into a bunch of surfaces on the normal of the overall surface.

Then convert those surfaces into two polysurfaces (one for U one for V).

Use the polysurfaces to split the the resulting surface.



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