How to convert "list" type , input that can be used?

Hi All:
I need to enter the value “PolyCurve.Offset” among,
But my source is a “List” type.
Is there a kind of method can be converted?
I beg yous expert assistance.
Thank you!


I don’t know

It works for me…


Thanks for any help!
I am currently using this solution.
Also does this written description Where can I see?