Hi Michael,

Thank you for your answer.

i liked the idea of not having to create and extrude each time you want to have a displacement in a Given plane, so using a CPlane is a great idea.
unluckily, i created the Cplane, but i am not able to snap onto the intersection between the Cplane and the line.
i am using Moi 4.0.

A video has been added in the same link.

Hadri1