Michael, thanks for the reply.
You do not quite understand. Maybe it's my English is to blame.
When I spoke of CATIA, it did not mean all of its functionality. I was talking about a small part of it for building surfaces. I agree that this is a high level of CATIA CAD software, but its complexity is not in the geometry modeling, but in a variety of different modules and the ability to automate everything. Well, if you can not project a line exactly, then okay. The main thing that has continuity in the network and guides when blend with continuity to other surfaces, and also the continuity of the sweep. Then it will be very cool!