Use the following steps to copy a route on the page Settings > Inbound/Outbound > Mail Routing:
Steps
Select a route in the route list by marking the check box next to its name.
Click Copy.
A new route appears in the route list, using the original route name followed by a number in parentheses. The number added indicates the order that copies of the original route
are created (1, 2, 3, etc.).
Click the new route name to edit route properties as desired.