To manage items choose Tools | Manage Items from the main screen menu. The following screen will appear:

This screen will allow you to view information on each item. You can
also use this form to add or edit item information. To view information
on an item, select the item from the Item pull-down list. To edit
information on the currently listed item press the Edit button. The
fields will now allow changes to them and the Save button will become
enabled. After making your changes press the Save button. To add a new
item, press the New button. All the fields will become blank allowing
you to enter new information. When you are finished entering
information press the Save button to add the new item. To delete the
current item click the Delete button.
The items listed here will show up in the Item selector list in the main billing screen.
Fields Explained
The Item field is a unique identifier for the item. Every different
item must have it's own unique ID. The duration field indicates how
long using this item in an appointment will take.