Hi there, @Martingorman. Yes, you can delete all the transactions by purging the company file in QuickBooks Online (QBO). Let me share more information about this process.
You can purge the company file if you're subscribed within 90 days of signing up. Before doing it, I recommend getting the reports of your important data for documentation purposes. I'll guide you through the steps below:
- Log in to your QBO Company.
- Change the URL to include /purgecompany.
- You will see a summary of the items to delete. Type YES to delete the data, then select OK.
For more information about the process, you can check out this article: Delete your data and start over in QuickBooks Online.
I've also added this reference in case you want to get specific data on your record before purging your file: Customise reports in QuickBooks Online.
Please let me know if you have other concerns regarding the purging process and I'll be happy to help. Take care!