RCM allows you to either load all Services "after the event" or use the Periodic Maintenance facility to plan your services in advance.  You can also use a combination of the two.

Using the Periodic Maintenance feature can be useful as it allows you to schedule certain services for your vehicles, such as changing tyres or fluids in advance. Conducting these services on a regular interval aids in preventing extensive damage to your vehicles in the long run and keep your vehicles running in their best condition. 

For more information on setting up the Periodic Maintenance function view the Vehicle Servicing article.