I need to remove all amendments I made

Hi info-occasionsbr, thanks for posting on the Community

If you need to make amendments, you can find, review and edit transactions in your account history.

If you're looking to start over in QuickBooks Online instead, you can purge the account data (within the first 90 days of the subscription start date). 

To speak with a member of our support team for further advice, call 0808 234 5337 (8 AM to 7 PM, Monday to Friday). We also have live messaging available 8.00 AM - 10.00 PM Monday to Friday, 8.00 AM - 6.00 PM Saturday & Sunday.