How to reset Zoho Commerce

How to reset Zoho Commerce

Hi,
we are preparing a new onlineshop connected to commerce and books for going live in the next days. Now we want to delete all tests and transactions we made within the development process. And also add a new tax rule which is not possible at the moment (we asume due to existing transactions). 

How can we reset the system or the transactions without loosing the configuration? 
Thank you!