Welcome to the Community space, chfabricators2. We'll provide information to ensure transactions will no longer be posted twice inside QuickBooks Online (QBO).
If you're using online banking, know you'll want to want the downloaded transactions to exist and avoid adding them to the account. This way, you can link both transactions and avoid causing duplicates.
However, if you accidentally downloaded transactions twice, you can exclude them from your Banking page to remove duplicates. We'll write down the steps below to get you going:
Access your QuickBooks Online company.
Go to Transactions Tab, and then select Bank transactions.
Select the For Review tab.
Click the checkbox of the transactions to exclude.
You can inform us in the comment section if you need further assistance managing bank transactions inside QuickBooks, chfabricators2. We'll make sure to be around. Keep safe.