You wrote:

"...the second is redraw with one or more curves perpendicular between them for make a surface of what you want exactly
and past it to the ring tube!...
Can be of course quasi all forms you want...
Like here with a Flow function..."

After pasting, you do a cut and delete the cuttet part? (I tried to modify the cutted segment, but I got no points to move...)

And if cutted out - I tried to make a rotating profile. But like you can see the surface from this higher part to the ring is not smooth.

rgds. Mala