Historical sales are different from sales history entries!

If you completed the procedure To add a customer card, you entered monthly sales totals for your customers and employees for the months that occurred before you began using AccountEdge; that information is useful for reporting purposes, but is optional.

The historical sales you enter are different -- they're sales that your customers made before you began using AccountEdge but haven't fully paid off yet. Because your customers still owe you money for their purchases, it's important that you record these sales in AccountEdge. This step isn't optional.