Extruding and encasing a floor segment

To extrude a segment from a floor:

1. Hold down the Alt key (Windows) or the Option key (Mac).
2. Click on the segment you want to extrude.

To encase a segment from a floor:

1. Hold down the Alt key (Windows) or the Option key (Mac).
2. Click on the segment you want to extrude.
3. Double-click the outward-facing segment dot that aligns with the main floor.
4. Select the segment's wall.
5. Move the wall inwards.