Open the Addresses Sub Menu and select New Contact. The addresses/details window appears.

From the menu at the top select 'Vendor' or 'Customer' and then complete the rest of the name/address details. At the bottom is a box labeled 'Code'. Each contact needs a unique abbreviated 'code'. Many lists and grids and printouts throughout the software might not have enough space to show the whole company name so this abbreviated name will appear instead so keep these short if you can. Just 5 or so characters is ideal. When you're done click the 'Save' button.