Create a cylindrical shape

can someone help me with finding a command?

I have a curve. with ‘extrudecrv’ I extend my curve and with ‘offsetsrf’ I can create a volume with rectangular shape.

However, I want a circular cross section instead of rectangular. Can anyone help me how to do it?

Choose your curve and call ‘pipe’

Thanks for your reply. But when I have multiple curves which are interseting each other, I cannot apply this command.

Run pipe on individual curves.