loft nurbs to spline?

[Brian Jones]

sure, make the loft editable (or do a Current State to Object) – in edges mode select the edge you want to follow – choose Structure/Edit Spline/Edge to Spline

This assumes v9. If you are working pre-9 there was a plugin to turn edges to splines (but I don’t remember which it was).

[Adam Trachtenberg]

You can also project a spline onto any object. Structure>Edit Spline>Project

[Paul Sullivan]

Thank you Brian and Adam that’s very useful