Choose Surfacing tab→Surfaces group→Extruded Surface :

Do one of the following:

• If you want to draw a profile, select a planar face or reference plane.

• If you want to select a profile from an existing sketch, on the command bar, on the Create-From Options list, click the Select From Sketch option. This option is not available if there are no sketches in the document.

Draw or select a profile.

Click to define the side of the profile you want to construct the surface on.

Define the extent of the surface.

Finish the feature.