In each Add-On Product folder, you can store your assets in whichever structure best meets your needs. However, you must ensure folder names do not contain spaces or special characters. In the following example, we have used the following: Audio Environment Particles RailNetwork RailVehicles RouteMarkers Scenery Stations System TemplateRoutes TimeOfDay Weather If you use the same folder names as we have at this level you will get icons in the blueprint editor (see below). If you use other names you will not get these icons. These folders can then be subdivided to organise your source files. For example, in the Scenery folder we have further subdivided our assets into the following: /Scenery Animated Billboards Buildings Characters Clocks Clutter Procedural Structures Vegetation Vehicles Wildlife Once you have set up your structure, you will find that your folders appear automatically in the Blueprint Editor:  |