Once you have correctly defined the shipping classification for your first Shipping Agent and Shipping Agent Service you can copy the entries to another agent and/or service via Copy Shipping Classification function. This is found on the action bar of the Shipping Agent Classification page as Copy Classifications. This invokes the following request page.
You need to define the shipping agent and service you want to copy to; it will default to copying from the one that you were on when you invoked the function. You can also set filters on item Numbers or classification codes if you want to replicate a subset.
On confirming OK the system will create the entries if they do not exist or update them if they do.