thank you for the tip once again EHNisja.

I did it like you told me, and now I am more closer to what I want to do (look at the image).

 

But I want my surface to change along the rail. Not to be the same, like it is in the case of using the "RailRevolve" command.

That`s why I tried to use the "_PointsOn" (control points) command.

But it says:

 

"Cannot turn on points for polysurfaces."

 

So what should I do?