Hey @FredsTinyHouses, I’d like to suggest a workflow that doesn’t involve an extension (although that one by CMD is still a good option for you). The accompanying image might be enough info, but here’s a bit more about this method if needed:
Example: I have 13 SketchUp Scenes in a model where I haven’t yet bothered to adjust any of the Shadow Settings to lighten or darken the feel of the space. Now I decide I need to adjust the Shadow Settings (while in Scene 1), but I don’t want to go to the remaining 12 Scenes and manually make this update one-by-one. No worries… I can just shift-select Scenes 2-13 and bulk-update those simultaneously by clicking on the Update button in the upper left of the Scenes panel (circular arrows) and unchecking everything except “Shadow Settings”, and then clicking on “Update”.
This is the same process as your situation with Layers, you’d just selectively bulk update a bunch of Scenes at once by unchecking everything except “Visible Layers” after turning off your newly-created Layers. If the aforementioned extension works well with your issue, what I’ve described here will still come in handy when you need to swiftly update other properties in existing Scenes.