Hello, gamachecatering-. 

When receiving checks from your customers/clients, you'll have to deposit them to your actual bank. 

You can record the deposit in QuickBooks Online (QBO) by choosing the Add funds to this deposit option from the bank deposit window and selecting checks as the payment method.

Here's how: 

1. Click the +New button and choose Bank Deposit.
2. Pick the Account where the funds will be deposited.
3. In the Received From section, choose where the money is coming from.
4. Select the customer's account.
5. Hit Check as the Payment Method.

You can refer to this article that provides more details about the process: Record and make bank deposits in QuickBooks Online. 

We'll be right here if you have additional queries with the QuickBooks deposit checks processes. Have a great day!