Could I delete a bank accdount which got reopened when transferred from desktop to online quickbooks

Hello there, 

Glad to hear from you again. I hope all is well on your end. I'll be happy to share more info about deleting a bank account in QuickBooks. QuickBooks Online makes it simple to manage your bank transactions and I'll be glad to assist. 

To disconnect the account, follow the steps below: 

1. In the navigation bar, click Banking, and then select the Banking sub-tab.
2. Select the account you want to delete, and then click its Edit icon 🖊️, then Edit account info.
3. In the Account window, select Disconnect this account on save.
4. Click on Save and Close.

The account stays in QuickBooks, and it isn't automatically updated with downloaded transactions. Give this a try and if you have questions, don't hesitate to reach out. I'm here to assist.