The Extrude

The Extrude PropertyManager defines the characteristics of extruded features. You can create these types of extruded features:
Type of Extrude
Solid or thin
Boss/base
Cut
urface
To create an extrude feature:
reate a sketch.
Click one of the extrude tools:
Extruded Boss/Base on the Features toolbar, or click Insert, Boss/Base, Extrude
Extruded Cut on the Features toolbar, or click Insert, Cut, Extrude
Extruded Surface on the Surfaces toolbar, or click Insert, Surface, Extrude
Set the PropertyManager options.
To extrude in both directions from the sketch plane, set the PropertyManager options in Direction 1 and Direction 2. To extrude as a thin feature, set the PropertyManager options in Thin Feature.
Click OK .
(fr.solidwork help)