Packages are a group of services which can be delivered at a special price (or not) and then sold directly to clients as a Sale
To find out more about the difference between Packages and other services click here
Once you have created a Package (under Sales & Products) and your client has bought the Package, you can add the Package service/s into the calendar
Start by clicking the green + button top right and Adding an Appointment, then Choose Appointment type as 'Package'
In the Create appointment Screen, first choose your client, location and add any notes.
Next, choose the date and time for the appointment and then select from the dropdown the package - only packages purchased by this client will show here.
Click Save in the top right corner when you finished.