Before you can create a shape, you must create a curve or set of curves, or you must already have a curve or set of curves in your wire file. You must also have a canvas plane in the window where you create the curves. (See Create a canvas plane.)
Curves are the basis to develop shapes; shapes can be used for painting, masking, or invisibility masks.
You can easily create shapes from curves using the Global Auto-Shape section of the Paint control panel. The Global Auto-Shape section is visible when you have a tool from any palette other than the Paint palette selected.
To create a shape from curves using Auto-Shape
 from the Curves palette.