Which inventory method orders the difference between the on-hand balance and the authorized level?

The inventory method that focuses on determining the difference between the on-hand balance and the authorized level is known as a shelf count. This method involves physically counting items on the shelves to assess what is currently available in stock. By comparing the physical count with the designated authorized level of inventory, it helps identify discrepancies and ensures that inventory levels are maintained effectively. This process is crucial for managing inventory accurately, as it allows for timely replenishment of items that fall below the authorized threshold, ultimately aiding in inventory control and operational efficiency.

This contrasts with the other options, which do not specifically focus on the discrepancy between current stock and an authorized level. For instance, CUST refers to customer-specific inventory management, while order quantity and static methods may not emphasize the physical counting or comparison aspect that is central to maintaining accurate inventory levels as outlined in the shelf count method.