Part Modeling > Base Features > Extrude > Basics of the Extrude Feature > About an Extruded Cut
  
About an Extruded Cut
You can use the Extrude tool to remove material by projecting a sketched section normal to the sketching plane.
You can use open or closed sections to create a cut. Removing material using a closed section creates a slot. To create a cut, use the same depth options as for extruded protrusions.
While defining a cut, you can switch between the following feature attributes:
Cut and protrusion by clicking Remove Material
The side where material is removed by clicking Flip Material Side
Solid and thin cut by clicking Thicken Sketch