Step 1: From your Dashboard, click on Customers from the Contacts tab.

Step 2: Click on the customer you wish to add an address.

 Step 3: Click on Additional Addresses.

Step 4: Once you have opened Company Info, click on + Alternate Address under the Alternate Addresses tab.

Step 5: A box will pop up where you can add the address. Click Save when you are done.

Step 6: Once it is saved, you will be able to see the new address under the Alternate Addresses field.  Click Save at the bottom right to finish.