You can create projection geometry using the Project tool or Line or Arc tools. When creating lines, arcs, or splines, you snap the entities to a constraint that is created by the projection of background and temporary cross-sectional entities. When using the Project tool, you create sketched geometry by projecting model geometry and temporary cross-sectional geometry onto a sketching plane. While rubberbanding, you can use the Project tool to select 3D background geometry and temporary cross-sectional geometry and reference them for sketching a geometric entity. The 3D geometry of the following types can be projected using the Project tool:

All one-dimensional geometry types – lines, circles, circular arcs, ellipses, conic arcs, splines – can be projected.