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Hello there, @steve137.
If the credit card is already linked to QuickBooks. You cannot link it to the checking account. However, you can manually upload the transactions in QuickBooks.
First, you'll need to pick a date range, here's how:
Then, download the transactions from your bank:
For more detailed instruction, please read out this article: Manually upload transactions into QuickBooks Online.
Also, you can refer to this article if you have issues when manually upload bank transactions: Fix bank upload errors in QuickBooks Online.
Please let me know if you have any other questions. I’m always here to keep helping. Have a pleasant day ahead.