Nurbs Curve OBJ: Filename of the obj
Control Point: Creates a Start & Control point for the curve
Discard First/Last Point: Removes the first and last point from the curves
Surface Name: The surface name you want to assign to the curve
Format: Usually, you can check the format of the curve if you are not sure, by opening up the .obj in a text editor. Most of the time, the format is mentioned within the header of that file
Creation: Choice of making curve geometry or 2pt polygon structures, when allowed
Weight Distribution: Defines the optional weighting of the points, when allowed