The function is called Sales Summary. You use the Sales receipt, listing the same info as the Z-Out, and you leave Customer blank. You don't need Customer entered on sales receipts. Or, you might have 2 tills, so you use Till 1 and Till 2, for example. You set it up and Memorize it, and now it is a daily worksheet.

Please read this Blog post, that explains it:

Desktop Sales Summary