You would use a curve as the loft path(path). Then use a curve as the profile(profile). Then you can adjust the spin of the loft(tapper). To do this select the path curve and in properties editor under curve tab expand geometry panel. Under bevel change it to object the assign it the profile curve. You can adjust spin cut by selecting the tapper curve under taper object which should be above bevel if I remember correctly. At some point they added a profile option which allows you to create a profile without having to use another curve. I think it was 2.92.
