Service contract type defines the list of maintenance services and their intervals for a specific vehicle inventory so you need to create a maintenance service contract type for each vehicle inventory, for example, the ‘Cab Maintenance’ contract type for cabs, the ‘Limo Maintenance’ contract type for limos, etc.
Click ‘Service Contract Types’ in the ‘Settings’ group of the main menu, and then on the ‘Service Contract Types’ page, add as many types for scheduled maintenance as you need.