Customer Ship-To's are the main use for Contact especially with your large customers.
On Quote, Order, or Invoice after selecting Customer, click Other in Ship-To to choose a Contact to fill in Shipping Name, Address, Email, Tax Status, Store, and much more.
Choose Live List in My Prefs, Dialog Prefs, to use a dynamic list with column Filters. Filter to find addresses instantly among hundreds of Ship-To's for national customers.