The Days of Service tab within the customer account allows you to setup the carrier that will be used by default on any given day of the week for a specific customer.
Setting up Days of Service per Customer
To setup the days of service for a customer follow these steps:
If the settings Show the Arrival Date Instead of the Ship Date and Outbound Freight are enabled, the system will display the Transit Days and Cube rate columns for the mass update option. Leaving those field empty, the system will keep the information previously set.