Hi 

Please inform me if there is a way for me to make a discount on the Grand total amount of an order. (The red circled number of the attached image).

In my situation Ideally, it would be made automatically because I have a fixed discount which it depends on the grand total amount.

For Orders from 50 Euros to 99.99 Euros, the discount is 5%  

For Orders from 100 Euros to 149.99 Euros, the discount is 10%  

For Orders from 150 Euros to 199.99 Euros, the discount is 15%  

For Orders above 200 Euros discount is 20%  

Thank you