For viewing, editing and selecting convenience, you might want to create all of your geometry on a layer separate from the rest of your part. The same is true for curves and other elements. Layers are a good organizing tool.
You can’t delete or rename the World, Setup and Stock layers. The program requires those three layers in the part file definition.
When a layer is selected, every entity created afterward, including curves, is placed in the new active layer.
Steps for creating a new layer for the geometry to reside on.
Elements can be changed from one layer to another using the Change Layer command in the right mouse button pop-up menu or from the Show fly-out. Change layer is also available in the Edit Menu.