Anew data tree stucture help

Can you please tell me how can I create a new tree structure?
I am trying to achieve selection of the entire row (by u and v), not segment by segment. (17.7 KB)

Why don’t you use Iso Curve?

unnamed (20.2 KB)

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OO, thanks! Perfect solution!
Now I will know about such a component.
Perfect solution!

I don’t understand what you want but you might start with this? (17.8 KB)

Or if you want straight segments: (20.1 KB)

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Joseph, thank you very much for your work. Basically HS_Kim solution
suitable for further work.
However, your solution will help me understand the structure of lists better.
i appreciate your help!