Final answer:
The document required to accompany reconciled cash submitted to the main cashier's office is a deposit slip, which serves as a record and proof of the cash being prepared for deposit.
Step-by-step explanation:
When a department submits reconciled cash to the main cashier's office, the document that typically needs to accompany the cash is a deposit slip. This slip serves as proof that cash has been counted and prepared for deposit in the company’s bank account, and it also provides a record for both the department and the cashier’s office. The deposit slip must be filled out completely, listing the total amount of cash and checks, if any, and signed by the individual responsible for the cash. This document ensures that both the department and the cashier's office have a consistent understanding of the amount being deposited and can reconcile their records accordingly.