How to add a customer to a sale

The Ready prompt appears at the bottom of the selling screen, just left of the sale total. When it appears highlighted in yellow, it is ready for the user to enter a product SKU number or a customer number prefix by the "+" sign.

**Assumptions: Selling screen is present.**
Step	Keys to press	Result
1	+100004	The program attempts to locate the customer by number, (100004), from the customer file. If found, the customer is attached to the selling screen. Otherwise, a message alerting the user that the customer could not be found appears.

Alternatively, the customer lookup may be used to locate, add, and/or select a customer.