[SOLVED] How to extrude a group of polylines

I am trying to extrude a group of polylines with grasshopper, but I don’t know how. Is it possible? - Attached is my GH file.

Sine.gh (23.5 KB)

Sine_re.gh (25.8 KB)

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Sine_re.gh (23.8 KB)
You should provide some more info about what you want to achieve.
See the orange message box in the extrusion component, it is saying “1. Cannot extrude Group geometry.”
You used groups as a way to manage a set of curves as a single entity… I suggest you, instead, to work with trees.

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Thank you very much @maje90 and @HS_Kim - it is solved, and learned a couple of new things.