I never could find a way to do it. I just added mine on "My Itinerary" and then added it as a note. Then I just put the info for my tour in and then added my confirmation number as a comment so that I wouldn't forget it.
The only way (currently) is to add it as a 'Note'.
Select 'My Itinerary' from the My Disney Experience dropdown menu. Change to the day of the tour, then select 'Add a Note' from the 'Add Plans' dropdown.
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