How do I project selected edges onto a sketch plane

I have a situation where I have to create a feature based on the projection of the edges of other 3d objects onto a sketch plane.  For instance I can do a loop trace on an desired edge of solid object but cannot seem to transfer that information to the defined sketch plane.  This is something that I did manually many times on a drafting board in the years before cad. Anyone know how to do this in SW?SolidworksSketching