In order to find the number of products that have been sold, either per product or in total for all the products you have added, you download the "products" report.
Go to the "reports" tab and select "products".
In the "Products" column, select the product(s) that you want to issue a report for.
Ιn the "Products' commit date" field select the desired time period.
If you want to see the total sales for a product, in the "Products' commit date" field set the date sales started (or earlier).
After making your selections for the report, press "show" and "export to Excel".