About an Extruded Surface
With the Extrude tool, you can create an extruded surface by extruding a sketched section to a specified depth in the direction normal to the sketching plane.
• Define the depth of the extruded surface using one of these depth options:
◦ 
Blind—Extrudes a section from the sketching plane by the specified depth value.
Blind—Extrudes a section from the sketching plane by the specified depth value.◦ 
Symmetric—Extrudes a section on both sides of the sketching plane by half of the specified depth value.
Symmetric—Extrudes a section on both sides of the sketching plane by half of the specified depth value.◦ 
To Selected—Extrudes a section to one of the following:
To Selected—Extrudes a section to one of the following:▪ 
—Extrudes to a selected point, curve, plane, surface, quilt, or body.
—Extrudes to a selected point, curve, plane, surface, quilt, or body.▪ 
—Extrudes to an offset of a selected point, curve, plane, surface, quilt, or body.
—Extrudes to an offset of a selected point, curve, plane, surface, quilt, or body.▪ 
—Extrudes to a translation of a selected point, curve, plane, surface, quilt, or body.
—Extrudes to a translation of a selected point, curve, plane, surface, quilt, or body.• An extruded surface can have open or closed ends. To create an extruded surface with a closed volume, select the Capped ends check box on the Options tab to create an additional surface to close off the feature.
 | The Capped ends option requires a closed section. |