a question about roto

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for example
I have a roto node .It has 10 bezier line.

I just want to copy the selected lines to a new roto node. how to write Script?

now i have a Script this script just copy all bezier line to the new roto node. How to optimize this Script?

Script
rL = nuke.selectedNode()["curves"].rootLayerfor i in rL:
n = nuke.createNode("Roto")
n["curves"].rootLayer.append(i)

usage selected roto node. Running this script. (There are a few bezier line in this roto node)

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Please help me！！！