If you close and reopen your linked SketchUp file (.skp), it will reload the content from the OSM file. If you save your OSM file and then save your SketchUp Model, the SketchUp Model will maintain a link to the OSM. Saves your OpenStudio Model as an OpenStudio file (.osm). It does not close your current SketchUp file, but loads a different OpenStudio Model into it. Use this feature to close your current OpenStudio Model and open an OpenStudio file (.osm). If you want to add additional template types you must go to the Extentions/OpenStudio User Scripts/On-Demand Template Generators/Space Type and Construction Set Wizard. On a PC the template dialog will be available once and you can choose templates. On a Mac it creates an empty model and you have to go under the menu item Extentions/OpenStudio User Scripts/On-Demand Template Generators/Space Type and Construction Set Wizard to add template items like constructions, schedules, and space types. This tool closes your current OpenStudio Model and creates a new one.
These functions are also located the OpenStudio Plug-in menu. Tools in this set create, open, save, import, or export data to or from your model. This section provides the legend for toolbars and menus available in the Plug-in. OpenStudio SketchUp Plug-in Interface Guide