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Hello there, @officesecretary-.
You'll have to put an identifier for the income account so it will be the same with the expense account.
To know more about chart of accounts, please check out this article: Understand the chart of accounts in QuickBooks.
Also, you can read out our Help articles it provides tips and answers your How do I questions in the future.
I'd be more than happy to assist if you have more questions. Have a good day.