I deleted over 300 bank transactions and today the Online bank administrator has reimported them. Can someone delete them permanently?

Hi there, @penny17.

If you're referring to the imported transactions in QuickBooks, these can be deleted through the Banking menu. However, if you mean to delete existing transactions in your actual bank, we don't have access to that.

I'll guide you through the steps on how to delete those imported transactions in QuickBooks. I also added some screenshots for your additional reference.

1. Go to the Banking or Transactions menu, select Banking.
2. Select the correct account that has those imported transactions.
3. Locate those transactions in the For review tab and check the boxes to the left.
4. Click on the Exclude button.
   
   
   
   
5. Go to the Excluded tab and click the checkbox on those transactions.
6. Select the Delete button.
   
   

I'd recommend checking this article to know more about excluding bank transactions in QuickBooks: Exclude expenses from downloaded bank transactions.

Moreover, you can check out this page that can contains key points on managing reconciliation when you're ready: How to Reconcile an Account in QuickBooks Online. This also contains sub-topics such as fixing discrepancies and unreconciling an account.

Please know that I've got your back if you ever need an extra hand. Take care.