Please follow the below mentioned steps to delete all the product across all branches:
Step 1 : Go to Products & Services section >> Click on Actions button >> Delete All.
Step 2 : CheckIn the box Delete from all branches.
Step 3 : Enter Delete in the column >> Click on Request OTP.
Step 4 : Enter the OTP and Verify.
Note : Once the products are deleted it is not possible to restore back and also you cannot check the inventory timeline.