1. Click on the Inventory module on the left side menu.
2. Click on Services.
3. Click on Add a service.
4. In the new box that pops up, choose between an existing category or create a new one.
5. Give your service a title.
6. Choose if your pricing is per person or fixed, seasonal or year-round.
7. Save your changes.
You will be directed to the service page, in which you can set up all the details by navigating through the options on the left side menu: