we have plans for multi select soon, the entire scene management tools are going to be redone for faster and more efficient workflow. For now, set the first one up. Save as a preset, then drag the preset to the scene aswell.
Presets are the sceneEntity in the scene with model, material, set scale, and any actions or scripts attached. It is saved as .preset/.xPreset and can be loaded into the scene to save you having to remake the physics each time.
Just go through each building type and create a preset.
We will make a preset workflow video.