Hi Andrei, so I guess it would help me to know what it is you'd be looking to gain by having a saved cplane on that planar surface in your example there, rather than just using the automatic alignment that comes just from snapping onto that surface already... I could maybe guess a few reasons why that could be useful but it might be good for me to know more specifically why the direct on surface drawing is not working for what you need already, maybe there are improvements I could make to it.

- Michael