You use the Customer Template table to make a template with the information you need to be able to create a customer based on a contact, or with the information you need to send a quote to a contact who is not yet a customer.
You enter information such as the code for the template, a brief description, the country/region, territory and currency codes, and so on. If the contact is not a customer yet, these latter fields are used as search criteria by the system to match a contact with the customer template on a sales quote.