At the moment, although you can produce a pie chart report of sales by sale code, there is no facility to export a CSV giving the details of sales by sale code and/or product.
The existing CSV breaks down into individual sales for each item, which could be 1000s of lines and is not as useful as an overview especially as the product code / sale code is a number rather than a name.
This would be very helpful to determine the best selling products etc.