Check to see if you have a license for Pro/SCAN_TOOLS (comes with WF2 FA,
don't remember 'bout WF). If you do, create in Independent Geometry
Feature. Menu: Geometry -> Sample Data from File, select High Density
to read in a points file (ibl or (?)pts) and play with it. The resulting
scan curves(?) will make a decent visual reference. "Real" curves (that
can be selected for geometry creation) can be created from them (Menu:
Geometry -> Curve -> From Sample Data). ... And that's about the extent
of my playtime knowledge. `;^)
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P.S. There are example ibl's for points and curves in Help.