Hello, I have many costumers and each one of them buy some of my products several times per month, so would perfect if we can see the sum of the product quantity as we see the sum of the grand total or paid column. I really need this to make my own reports, get the margin percent, get the average sales prices and cost price, to see if one month a costumer bought me more or less of a product by pieces, etc… or if you can add it to me with an extra charge please let me know.