Log in to your QuickBooks Online account.

Click the "Settings" gear icon in the upper right corner.

Select "Account and Settings" from the drop-down menu.

Click the "Sales" tab on the left side of the page.

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If you are a business owner who uses QuickBooks Online to manage your finances, you may need to add a sub-customer to your account in order to track payments and invoices for a particular project or client. This can be especially useful if you are working with a large client who has multiple divisions or departments that need to be tracked separately. Knowing how to add a sub-customer in QuickBooks Online can help you keep your financial records organized and up-to-date.

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