A beginners question I’m afraid. I’m struggling with placing 2D sketch shapes in the correct plane. To explain:

I’m trying to draw a cubic body with a cylinder projecting from the top surface.

I set my view to top and draw a rectangle. This places the rectangle on the reference X Y plane. I switch to a 3D view and extrude the rectangle in the Z direction by, say 5mm. So the top face of this body is now in the XY plane but 5mm up in Z. Let’s call this plane P. Now I want to add a cylinder whose base is on plane P and extends 10 mm in Z, ie 15mm from the reference XY plane. So I need to draw a 2D circle and extrude it. The bit I’m stuck on is how to start that circle on plane P. If I go to top view and sketch it, I end up with it on the reference XY plane. What I really want to do is sketch it on plane P.

As I said, I’m new to this, so I’m perfectly happy to be told I’m going about this in totally the wrong way!