Sweep2 rails to a curve?

Im trying to complete this shape to a smaller opening, the circle. I’m kind of at a loss for options here. Maybe sweep2 and scale the end opening down? Is there a single command for this? I need a sweep2 to a curve command.

Why isn’t Sweep2 working? I probably don’t understand what you want to do…

hi Dave Sweep2 should work here, either hit the command first then select both rail curves or select them first then the command, then both cross section curves (the circular one and the tunnel curve) maybe your curves are not appropriate, you could upload this part that people can have a look.

I actually solved it a different way. I used control points of the surface and rotated them up and scaled them down. I’ll check again but you can use two rails and two curves?