Everything that you place in the environment, whether it is annotations, measures, 3D objects can be saved to be later restored.
Saving and restoring a save
You may save your current layout (including cut parts of your space, annotations, measures, imported objects...) using the save menu in File > Save layout as. You'll be prompted to choose a save name.
To load a save you previously did, just use File > Open layout and select your previous save.
Saves are stored in the current environment data folder alongside PreVu3D application and only take context within the environment linked to the application.