Can I delete all data and start again. How do I do this?

If you are using QBO Simple Start or your account > 60 days, you are not allowed to purge your account. You should open a new blank account and cancel the old one.

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I can share some information about deleting all data and starting over to start fresh in QuickBooks Online (QBO), @susanmartindalze.

You can only delete your current account and then start over if it's less than 60 days. If it’s already beyond, I suggest cancelling your old account and creating a new one. It'll be automatically deleted a year after you’ve canceled it.

For a QBO account that is less than 60 days:

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

Whenever it exceeds 60 days, cancel your current account from the Account and Settings. Then, sign up for a new account. 

To cancel your account:

1. Go to the Gear icon and select Account and Settings. 
2. Select the Billing and subscription tab.
3. In the QuickBooks section, select Cancel.
4. Follow the steps to cancel your account. If you use payroll, you should cancel your payroll account too.

To start a new account:

1. Go to quickbooks.intuit.com and choose your subscription.
2. Follow the prompts to finish creating the account.

To learn more about wiping your data clean in QBO and starting over, refer to this article: Delete your data and start over in QuickBooks Online.

Then, here are some video tutorials that can help you get started with your QBO account: Learn about QuickBooks Online with how-to videos.

Know that you can always stop by here if you need assistance wiping all data from your account and starting anew. I'll be glad to help you further. Enjoy your wonderful day!