Constructing the third feature

1. On the CommandManager, click Features > Reference Geometry > Plane.
2. Click on the right-side face of the model geometry.

1. Click on the left-side face of the second feature.

1. Click OK.
2. Draw the sketch on the new reference plane.

1. Click Exit Sketch.
2. On the CommandManager, click Features > Rib.
3. On the PropertyManager, click Thickness > Both Sides.
4. Set Rib Thickness to 10.
5. Select Extrusion direction > Parallel to Sketch.
6. Check the Flip material side option.
7. Click OK.