Hi,

I've made 2 versions of what I think you want but maybe I got it wrong.

For the blue version, I use a line to join the circle edge with the other surface and then used sweep to create a surface on one side. I did the same on the other side and join all surfaces together.

For the red version, I basically started from scratch to create a more squarish object with a hole in the middle. I then used the new command flow in projection mode the get the red object.

Personnaly, I prefer the red version but it's a question of taste I suppose. Hope this help, I'm a newbie myself and wanted to try it.

Regards,
Felix