Yes, it will affect your original file as you have made changes to your original filed return. We hope that you have saved a copy of your return that you originally submitted.
If you still wish to delete a return, as long as you have not submitted that refile, it will not be transmitted to CRA. If you wish to "delete" the Refile you began in error, once you start or open another return in your online TurboTax account, you should see a little garbage can next to the Refile, and you can delete that file.
Thank you for choosing TurboTax.
