I'm starting on SW and I'm trying to make a smooth boss (from a sketch on plan 1 to another on plan 2) that would end up on an edge, but it seems that you need either a point or a closed profile to do the boss. So I don't know how to do it at all...
Just make two lines only 0.02mm apart and close them at the top and bottom. This will make you a rectangle with two edges only 0.02mm apart
On the other hand, your guide curves must connect to the corners of this mini rectangle. If your guide curves are straight lines, you don't even need them. See the joint model without guide curve