Thank you! Yes, you can do it. For such small projects, organization is not that important. But for medium projects, like mine here, I had to accurately organize my file in 2d layers and 3d layers, and then group them in 2d groups (for plans, so I can switch from one to another quickly) and 3d groups. For now I think this way of organization is the best I could do for architecture. But hopefully things will get better :)