Display the 3D Geometry sub-toolbar located in the
Operation toolbar and click Project 3D
Elements .
Multi-select the edges you wish to project onto the sketch plane.
The edges are projected onto the sketch plane. These projections
are yellow.
Important:
A canonicity detection is performed on projected curves according
to the application tolerance, in other words the application tries
to recognize Sketcher elements like line or conic curves.
Due to the canonicity approximation, changes may occur in resulting
projected curve types.