We can add an opening balance by creating a Journal Entry, userdziegenf.
Let me guide you with these steps:
- From the + New button, select Journal entry.
- Select Opening Balance Equity in the first ACCOUNT column.
- Enter the amount on the CREDITS field.
- Select accounts receivable account on the second line.
- Enter the same amount under the DEBITS column.
- Select a customer's NAME.
- Click Save and close.
With regard to recording a transaction on the account's receivable account, QuickBooks doesn't user A/R Sub-Ledger. All transactions default to a single A/R Accounts. That explains why it needs a customer name to identify where and to whom the balance is.
I've also added this reference as your guide when managing Account's Receivable: Track Your Cash Flow in QuickBooks Online.
Feel free to get back to me if there's anything that I can help with. Keep safe!