Thanks for this one. I'm a new user of sweet home 3d, I already finished my first model (it took me a while), and I guess I am a bit late to read this trick. I made my two-level house after reading the multilevel tutorial, I made it the second floor by exporting parts of the second floor in OBJ format and importing the file as a new furniture. It took a lot of time to finish my second floor because i need to cut parts of it and then integrate it to my first floor plan. Thanks hans for this. Kudos!

I just want know if the lights and lamps from a part of the room that i exported as an obj file useless? most of the rooms are dark and the windows are not transparent when rendering a snapshot of the room. Thanks! sorry if posted this inquiry here.