Lists>Accounting>Shipping Items>New: Unable to Select the List of Available Shipping Items under the Shipping Label Integration Field for USPS, FedEx or UPS Integrated Shipping Carrier Accounts

Navigate to Setup > Accounting > Shipping > Set Up Shipping page> Default Shipping Carrier field. Set to either:

a. UPS = if you want to add new shipping items for UPS

b. FedEx/ USPS/More = if you want to add new shipping items for FedEx or USPS