Creating service categories helps you streamline & manage your periodic vehicle maintenance with ease. How it works is, you name a category as 'Engine services' and add all engine related periodic services to that category.

How to add a new service category?

It's really simple, just follow the steps as directed. 

Path: Service and Maintenance => Service Category

And, that's just not it, system lets you create a new service category while adding a new service type. 

Service and Maintenance => Service/Renewal Types => Add New => Add New Service Category