I'll try your solution.
Thank you Keet

What you describe is an empty room without a ceiling.
Add a room in the empty space and switch off 'display ceiling" in the room properties dialog. If there are more levels do the same on each level.
This will leave the an open space to the sky.

Hello,
the apartment is on the second floor so ...

Good morning and greetings to all.
I have recently started to use this software I need to know how to insert an inner court inside a building.
It is basically a “cavedium,” an empty space between floors. Through the glass windows you can see the lower and upper floors.
How is it possible to create ...