How do I merge two itineraries together?

Information on copying here https://support.axustravelapp.com/hc/en-us/articles/208079663

AX-PERT Tip: If you are working with multiple itineraries with the exact same title, you will first want to add a traveler last name or any identifier into the title of each itinerary. This will allow you to easily know which itinerary you have chosen to copy the bookings into.