Click to enlarge the picture
Service module is designed to define and store the details of the different services you buy or purchase. This module works the same way as the Product module. Once defined, services can be purchased or sold, using the purchase order or sale order modules, and can be defined either as taxable or discounted.
Define the sales price and the purchase price
Define the product line you want to associate your service with
Create variations if a service has different prices for example depending upon certain criteria (see picture for example)