Use the Tube & Pipe Styles command to copy and modify existing style definitions and delete styles you no longer use. You can change the active style from the Tube & Pipe Styles dialog box or the ribbon. When editing a route, you can change the active style for that route, and the model updates to conform to the new style. For example, if switching from a rigid tube and fittings style to a bent tube style, the individual rigid pipe run components are removed from the browser and replaced by a single bent tube run.
When a tube and pipe style uses the conduit part or fittings in a library that is currently not available, you must configure the library before you can continue modifying this style and populating routes that use this style.