I'm trying to loft the surface of a model of an old 1930s race car in TC Pro 2017. For the cockpit section, the front edge is defined by a polyline with arcs and straight lines, all in a single plane. The middle section is defined by a 3D polyline that is in 3 planes. The rear edge is defined by a 3D spline by fit points, about 50 points, but the points don't lie in a plane or even a few planes, the spline snakes all over. I was hoping to loft it in strips, but I can't see how to split a 3D polyline or 3D spline at a node. I tried exploding the 3D polyline and then rejoining some pieces, but they won't rejoin. Am I forced to re-enter the 3D polyline in discrete pieces, by plane? Is there some way to "snip" a 3D spline at a node?