Category
Lists groups or categories of work types, such as Non chargeable re-work. The categories can be system defined or custom. You can add, edit, and delete the items in some categories, but not in all categories. For example, you cannot alter the Regular or Original Work category.
Items
Displays all of the work types in the category selected in the Category list. The items can be system defined or custom. You cannot modify or delete system-defined items. You can add, modify, or delete custom items.
Add
Click to add a custom item to the category selected in the Category list. This button is available only for some categories.
Modify
Click to modify a custom item selected in the Items list. This button is not available when you select a built-in item.
Delete
Click to delete a custom item selected in the Items list. This button is not available when you select a built-in item.