sketching boss
To create additional features in the part (such as bosses or cuts),
we can make a sketch of the model faces or planes,
then Extrude the sketch.
we can make a sketch on a face or planes,
and then make a feature based on one
or more sketches.
Click Hidden Lines Removed View on the toolbar.
Click Extruded Boss / Base on the Features toolbar.
Move the pointer to the front faces.
Changes to the ends of the faces to be highlighted
to show that the faces available for selection.
Select faces the front.
Click Circle on the Sketch toolbar
