You can refer to this tutorial: https://www.homestyler.com/forum/view/1681508383154233345
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Marianna Szép19 November
Try to go to 2nd floor and select "Customise floor". The floor of 2nd level = ceiling of 1st level.
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Grace Simmons18 November
You can't remove part of the ceiling. In plane view (2D), click on the room, right side menu-scroll to you see 'show ceiling' move slider and the ceiling for that room will be removed. Then use custom modeling to create ceiling where you need it.