If you wish to view the turnover for a specific product, click "Turnover" in the bottom menu which shows the turnover for the current and the previous year.
If you wish to add a product to an invoice, click "Add to invoice" in the bottom menu which shows the current invoices. If you don't wish to add the product to a current invoice, click the plus sign in the upper right corner to create a new invoice and then choose the customer you wish to create the invoice for and follow the guidelines. You can always change price, discount and quantity by clicking the invoice line.

It's just great to get your hands on such a simple and well-designed tool. In my case, my day-to-day dealings are made much simpler in terms of invoicing, customer overview etc.
Torsten Skaarup, Skaarup Teknik
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e-conomic is an online accounting software used by more than 48,000 companies and 4,100 accountants worldwide - from sole practitioners to large accounting firms. The software is easy to use and flexible, and you can give your accountant free access.