To create the appropriate Cashboxes, navigate to: Accounting > Chart of Accounts > +Account. Under Account Type select Asset - Cashbox.

Prior to the event at which you will be accepting cash, accomplish a Journal Entry (Transfer) to move change into the box. At the end of the event, complete the Cash Tally Sheet and note any cash retained in the box. This moves the deposit amount to the Cash Undeposited account and holds it there until deposited in the bank. When you deposit in the bank, use the Deposit - Match From Pending transaction and select the Cash Tally Sheet you want to deposit. It will auto-calculate the totals of the transactions for that period, and when you enter the actual deposit number, it will either balance or give you an over/under amount. The Cash Tally Sheet starting balance is automated by how much has been either transferred into the cashbox or retained from the previous event.