What is the proper way to delete all transactions on one of my chart of accounts and be able to start from scratch?

It would be my pleasure to share how you can remove your transactions and start from scratch, @accounting-intel.

We can only delete transactions one at a time from your Chart of Accounts. Another way is by opening each transaction and deleting them manually. So, deleting them by batch is unavailable.

If you wish to start from scratch, we have the option to purge your account. The system deletes all data entered into the company, and you're unable to reverse them. This is possible only if your QuickBooks Online data is less than 60 days.

To proceed, follow the steps listed below:

1. Log in to your QuickBooks Online account.
2. Change the URL to include /purgecompany.
3. Example: URL shows https://...qbo.intuit.com/app/homepage, change to: https://...qbo.intuit.com/app/purgecompany.
4. The next screen will provide a summary of the items to be deleted.
5. Type the word YES once the data gets deleted, then click OK.
6. Click Wipe Data once your selections are complete.
7. Once the deletion is complete, you will be rerouted to your home page.

If your QBO is already beyond 60 days, you may need to cancel the current subscription and start a new account. You can utilize this link for more information: Delete your data and start over in QuickBooks Online.

In addition to that, you can also check out this article to guide you set up your company, sales, expense, and advanced settings in this new account: Get started with QuickBooks Online.

That should help you start over! Let me know if you need further guidance with the process. I'm always here to help.