You can get to this part of the system by clicking on the Products > Services.
The Services module allows you to add labor-based services you provide. You can get to this part of the system by clicking on Products > Services in the blue Admin Toolbar. These services are available in the Work Orders module for use in creating work order tickets. The data for your Services is very simple and easy to enter. To create a new Service, click on the New Service button in the upper left. You can also delete unneeded services using the Delete button on the far right of each item's title bar.
When you add a new Service, you have the option of putting in a Description (useful if you have several services that are similar), as well as the Name, Cost, and Price. You will need to decide if you want to base the service on a certain interval and charge a set price for each interval in the work ticket. For example, if you do a Tear Repair and normally can complete such work in about 15 minutes, you could base your Cost and Price on fifteen minutes of work, and for longer jobs, you would charge multiples of that based on how long it actually takes.
Please note that as the Work Orders module utilizes the Services you create, you will want to have Cost values in the system for each one, so the Reports can be tracking your profit margins accurately. The Price, of course, is what you charge the customer for the service.