June 22, 2012, 01:52:45 pm
If you're using Lumion Free 2.1.3:
Move models to a Layer: Select the models that you want to move to a Layer using CTRL + rectangular selection. Then choose Context menu -> Selection -> Layer -> Move selection to Layer.
However, the latest version of Lumion includes 20 layers and more intuitive button-based layer functionality, but Lumion Free has not been updated to this version yet.
Please stay tuned for the release of Lumion 2.5 which contains a single installer for all versions.