You can add to cable tray and conduit runs in the following ways:
Use the Conduit Properties palette for conduit and fitting settings.
Properties palettes for conduit* and conduit fittings
*Shows expanded properties including parallel routing mode
Use the Add Cable Trays dialog box for cable tray settings and the Add Cable Tray Fittings dialog box for fittings.
Dialogs for cable tray and cable tray fittings
You can also manually add fittings to your drawing, which is beneficial when you want to create unique connections to other runs or equipment.