Hi jymm,
I am not sure exactly what you are asking. If you have the Customer Card up you can drilldown on the words "Address ID" and it will bring up an Address Window and click "Clear" and create a new Address ID for that Customer. In the Vendor Card drilldown on the "Purchase","Remit To", or "Ship From" and click "Clear" to create a new one. Or you can go to Cards>>"Vendor" or "Customer">> Addresses find the ID you want to add a new Address to and create it. ID's are free-form so you can call them what you want "Primary", "Ship To", etc.
Is that what you are looking for?