where do you give a ‘business purpose’ while defining a customer? explain its usage.

The business reason you have for communicating with a customer's address. For example, you would assign the business purpose of Ship To to an address if you ship to that address. If you also send invoices to that address, you could also assign the business purpose Bill To.

Bill To and Ship To are the only business purposes recognized in Oracle Order Entry. (Receivables QuickCode)