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Utilize the trial period of these 3rd party tools to delete them in bulk and reimport your CSV files
Hope it helps.
Hi there, @vlcarr.
In addition to Fiat Lux - ASIA, you'll want to delete the downloaded bank transactions and download it again. Ensure that you use the correct columns when downloading the CSV file.
Then, to delete those downloaded transactions in your QuickBooks Online (QBO) account:
In case you accidentally delete a bank transactions, it'll go to the Excluded tab for review before deleting it permanently.
Once done, download the transactions again. For additional reference, here's an article you can check: Import bank transactions using Excel CSV files.
Then, you can now match the downloaded bank transactions once done.
Let me know if you need more help. I'm always here to assist you.