Divide the lines by the surface

Grasshopper
1

Hello all
I’m trying to divide the lines by the surface into two parts.
Actually, I want to get the all lines above the surface.
I don’t konw if there is some tools can do it.
Thanks in advance.

Divide the lines.gh (5.9 KB)

fig
fig1380×614 324 KB

flow
flow1241×329 30 KB

2

syachcho-help divide the line.gh (7.5 KB)

3

Canvas at 18;45;09
Canvas at 18;45;091626×494 141 KB

Divide the lines_re.gh (9.2 KB)

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