Recreate curve segment from a long curve/ rhinocommon

I do not want to recreate whole curve.
I want to recreate(duplicate) only a part of the curve at parameter length.

Is there a direct method to do that?

You can give an interval to the ToNurbsCurve method - see
or use Trim with an interval

To get the parameter values at a certain length, use one of the NormalizedLengthParameter methods, there are many to choose from.

Alternatively, if you want to keep one of the curve ends, you can also use Trim with a length directly -

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