Loft circles along rail

Hello, I’m new to rhino, so I don’t know much about the commands that I should use. I want to create a loft that follow a path. From the picture, I want to connect the circles via loft, but along the curve of the semicircle. Any tips? Thank you in advance.

Hello - use Sweep1 for that, as far as I can see from the image.

-Pascal

It’s perfect ! Thank you very much !!