Service categories identify specific subsets of the labor, expense, and item invoice sorts. Each service category must reference an invoice sort when you define it. The invoice sort gives a high-level summary of the financial impact of its related service categories.

Each type of service category must be related to an invoice sort of the corresponding type. You can relate Items, Consumable Items, and Exchanged Items only to a type I invoice sort; Labor and Travel Labor only to a type L invoice sort; and Expense and Travel Expense only to a type E invoice sort.