Hi Community!
I need to calculate a cumulative sales considering 3 variables (in this example): period (year-month), country and product.
Example.... picture 1 shows sales history during 2019 01 to 2019 03, to 2 countries and 3 products.
picture 1

and here's how cumulative sales should be calculated
picture 2

Please, could someone help me with this?
Thanks!