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Check the "3D" box on the Options Bar and then use the Pick Lines tool to pick an edge. But you need an edge to pick.
You can 3D snap to simple curves. Double curves and/or those curvatures in the images you posted are too complex. I am pretty sure you will not be able to snap/form Structural Framing (Beams) to the edges of those Curves...
You will need to model them using other means ... such as
YOUTUBE | BIM | COMPUTATIONAL DESIGN | PARAMETRIC DESIGN | GENERATIVE DESIGN | VISUAL PROGRAMMING
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...another way: Basic Wall as Beam (red).
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