After creating a route assembly, the pipes and elbows can be modified using the 'Change Route Diameter' command.
1. Right click on the route assembly and select Edit Route.
2. While in Sketch Mode, click on Change Route Diameter (Tools > Routing > Routing Tools)
3. Select a route segment.
The property manager will show available configurations for each fitting.
4. Check the box next to Driving to show different sizes for the fitting. The rest of the fittings will only show configurations compatible the driving fitting.
5. Click Next to move on to the next route segment and continue updating fittings. The active route segment is highlighted in light green, completed route segments in dark green, remaining ones in orange.
6. When finished, Click OK.