# Services ## What is a service? 1. Services can be divided into main services and additional services. 2. Several main and additional services can be created with different prices. 3. Different prices are called price categories, one or more of which are assigned to products. 4. Main services and additional services are always linked to a [product template](https://help.advatra.com/books/knowledge-base/page/product-templates "Product templates") or a [subproduct template](https://help.advatra.com/books/knowledge-base/page/subproduct-templates "Subproduct templates"). ### Advantages of services - With services, price structures can be defined for a group of products and not only for single products. - Price changes can be made across a group of products with just one click. - Services can be used to determine which products are best suited to a trip, at what times, for what number of participants, etc. ### Structure of services - A product template can be linked to a main service. The additional service is optional. - A subproduct template can be linked to a main service. The additional service is optional. [![image-1654693341444.png](https://help.advatra.com/uploads/images/gallery/2022-06/scaled-1680-/image-1654693341444.png)](https://help.advatra.com/uploads/images/gallery/2022-06/image-1654693341444.png) ## Additional service category An additional service has an [additional service category](https://help.advatra.com/books/knowledge-base/page/additional-service-categories "Additional service categories"). With this, the services can be divided. This helps later while adding the product to an offer.