Problem creating surface

Hello everyone

I want to create a smooth untrimmed surface using three curves. Is there any way? Or an open brep will also work. I tried to create it but the brep I got always overlapped. I hope you can help me. Thanks in advance.

Tianci

problem creating surface.3dm (824.7 KB)

This looks familiar:

No matter what you do, you aren’t going to get a single surface from this, it will be a polysurface. OK?

Heads-up, this is a duplicate from

-wim