one surface - 3 curves

 From:  Michael Gibson
1817.4 In reply to 1817.1 
Hi Olga - I see I didn't read your message carefully enough and that you did already try sweep and boolean, now that explains why that was all set up nicely to do the sweep! :)

The boolean operations tend to expect interactions more between solids and planar curves. This is because planar curves are more natural to define a volume, and the booleans are more generally focused on volume type operations.

In this case you have a non-solid surface and a non-planar curve, you'll need to use Edit/Trim in this case to cut the surface instead of using a boolean.

- Michael