First image shows the kinds of panel lines a little exaggerated so you can see the topology. Basically I just want to have two lines or one line dip down in a flat or curved surface (as in second image).
Second image shows the rhino solid. The line marked with green (2) should be the panel line.
As you can see I duplicated the curve on the surface, but it is not connected to the topology, so I cant create the effect this way.
I would now go about this creating a shape to boolean-subtract out of there, but wonder if i might have just missed an easier solution.
Looking forward to your answers!