In order to serve the better customer service you categorize booking and customer into respective list. Generally, for photo lab accounting customer or booking is defines into such names like Advance Paid, Dealer, Credit, General etc.
When you would like to add new booking or customer types you have to follow this path.
Customer/Job Management> Other Master> Booking/ Customer Types>New Booking/Customer Types
As you follow the path at once a window will come to you in which you have to fill the following information.