Hi Stardust, usually for doing a flow in 2 directions you can use surface-to-surface flow instead of curve-to-curve flow. You would build a sweep or whatever to build a curved target surface and have a plane as your base surface instead of a line.

But it could be possible to make a script that would do curve-to-curve flow twice by picking 2 target curves.

It would help if you could post the 3DM model file of what you show there for your example instead of only a screenshot, that way I could test with your file to see if the script is doing what you were expecting.

- Michael