Adding a second floor to an attached garage

[Katalyst777]

When you build a new floor, you have the choice to either derive it from the floor below, or create a new blank floor.

If you choose the first option, just delete the walls you don't need.

If you choose the second, turn on the Reference Display so you can see where the walls below are on Floor 1, and draw in just the walls you need.

[BACLLC]

Thanks guys !