Select the waypoint, routes and tracks in the itinerary list to be
copied, click the Copy button at the bottom of the itinerary
page. Navigate to the target itinerary, then click the Paste
button.
Copy and Paste: The copy and paste operations must be performed in the same browser session.
The copy operation does not copy the entire detail of the items being copied, instead just copying a reference to them together with any criteria used to select them. Should the results change in between the copy and paste operation, different values may be pasted from those displayed at the time the copy was initiated.