Inset

To create a new face set into the currently selected face, you can use the Extrude Faces tool and scale the extruded face.

Inset faces give you a lot of flexibility for building more sophisticated shapes. For example, you can extrude an inset face inwards to create interior walls, or extrude outwards for a more detailed exterior.

To create an inset face:

1. Activate the Face mode.
2. Select the face you want to add the inset to.
3. Activate the Scale tool.
4. Hold Shift and scale along either axis of the face, and let go when you are satisfied. For example, if you want to inset the top face of a cube, you can scale along either the x-axis or the z-axis.
5. Scale along the other axis of the face to complete the inset. For example, if you extruded along the z-axis in step 4, then scale in the x-axis.