Want to add a single recipient to multiple lists? Simply click on the Lists tab, check the Lists you want to add the recipient to, and use the Add Recipient button.
This will bring you to the Add Recipient To Multiple Lists page where you can see the Lists Being Modified, add the Email address, and fill in any other fields those lists may contain. If a list does not have a certain field check the Add Field To All Lists button to add that field to all the lists selected.