Creating a New Sketching Plane
- 
                Click Select New Sketch Plane
                    
 in the mini-toolbar, or right-click and select
                    the Select New Sketch Plane option from the context
                    menu.
             - Hover over any existing geometry to display existing planes.
 - Click to select the highlighted plane and display the sketch grid.
 
Existing sketches are solidified, and a new Sketch node is added to the Sketching Plane in the tree. The previous sketch remains active temporarily until you start sketching in the new Sketch.
Note: Coplanar Sketch Constraints can reside on different containing planes.