Making holes

[Si60]

Is there a way to make holes in floors or in objects such as boxes?

[Puybaret]

You can make holes in a floor by importing an invisible box that you'll declare as a staircase in the 3rd step of the furniture import wizard (see also this tip).
You can't make holes in other objects in Sweet Home 3D, and you'll have to use boolean assembling function in Blender or Art of Illusion to achieve such an operation.

[Si60]

Many thanks for that advice Puybaret, with a bit of practice that works well.