How do I add a past due amount to a new invoice so the customer knows how much to pay

You can also create a customer statement in QuickBooks Online (QBO), traceylava.

However, it works differently from the Desktop version. In QBO, you need to select dates for the statement and the date range. Let me show you how:

1. Go to the Sales menu, then to the Customers tab.
2. Select the checkboxes for the customers you want to make statements for.
3. In the Batch actions dropdown ▼, select Create statements.
4. In the Statement Type dropdown ▼, select the customer statement type:
   • Balance Forward: Lists invoices and payments with outstanding balances for a specific date range.
   • Open Item: Lists all open, unpaid invoices from the last 365 days.
   • Transaction Statement: Lists all transactions for the selected date range.
5. Select the dates for the statements and the date range.
6. Review the customer's email addresses.
7. Select Save, Save and close, Save and send, or Print or Preview.

Aside from the customer statement, you can also a report that shows customer's balances. Please browse this link for instructions and detailed steps: Run an accounts receivable aging report.

Once you have the report, you can customize it to get the data that you need.

Let me know if there's anything else you need about getting past due invoices. I'll be right here to help you.