To create an extrusion solid a contour must either be input manually as a closed polygon ,or an existing contour can be used.
Input as a polygon can be performed in any view once a plane has been selected, see also ‘Inputting Primitives’.
To select a contour simply move the cursor over a surface in 3D or over a closed 2D contour, produced, for example, from a profile in the profile catalog.
When a surface or contour is detected, it is highlighted in red in the 3D preview and outlined in green in 2D.
The solid is now created directly with a left mouse-click. The following extrusion solids result for the examples shown.