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Hi there, sharmi,
Each invoice is a separate transaction in QuickBooks Online (QBO). Only one invoice can be processed at a time if your client is paying online.
If not, your client can make one big payment for all the amount due balances. Then, you'll want to record the payment by creating a deposit in QBO. After that, you can link it to those open invoices.
The following steps outlined below will guide you through:
Make a deposit paying multiple invoices
Link the deposit to all client invoices
I've added these handy articles for more details with the steps provided above:
Should you have follow-up questions, don't hesitate to leave a comment below. I'm always glad to help you out.
Thank you and keep safe!