I am a novice.
I create a surface by closedpolycurve，but I want to create an opening in the surface through a closedcurve.
Someone can help me，Thank you！
Assuming that’s a closed polycurve, then you want Surface.TrimWithEdgeLoops.
Be sure to put all the holes and the original boundary.
Disable the preview of the previous surface.
This shows how the node works, note the original geometry is displayed in a different shading.
https://dictionary.dynamobim.com/#/Geometry/Surface/Action/TrimWithEdgeLoops
Sorry，I overlooked.
Maybe I’m not clear about it, I got an L-shaped plane, but what I want to keep is the remaining large plane. What I should do next，thank you.
Include the perimeter curve used to make the original surface as a part of the shape by joining the two polycurves into a list with a List.Join node.
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It is useful，thank you for your help.