Split surface multiple curves

Grasshopper
1

Hello everyone

I’m trying to cull these segments of a surface as marked in the image and manually modelled rhino model.
Any help is appreciated.

PavTroubleshoot.3dm (278.5 KB)
PavTroubleshoot.gh (16.4 KB)
pvtrbsht001

2

sd
sd1583×631 75.7 KB

PavTroubleshoot_2.gh (18.1 KB)

3

Ahh great lesson! Thank you