From the POS window, enter the customer’s name as you would for a new order or estimate,
On the bottom left corner, click on the History icon,


To look for an invoice with a specific part, simply write in the search field the item (or part of the item) and press enter.
All invoices containing that item will appear in the top window. The detail of each invoice will be displayed in the bottom window.  If multiple invoices have been found, simply scroll down each invoice and the detail will help you look for the correct invoice.
To view or re-print the original invoice, click on the Print icon