Have a look here: http://www.gpsreview.net/tomtom-itinerary-planning/
it may be what you're looking for...
So you have a One 3rd Edition. Too bad! Itineraries are not a feature of this stripped down model.
But there is a way. Have you updated the firmware to Navcore 8? If so, you will want to roll it back to v7. Get it here:
(If you are still using v7 firmware, then you don't need to do this.)
Next, forum member Birdman has written instructions on how to create a custom menu that will activate Itineraries - a 'hidden' feature of the 3rd Ed. (v8 firmware kills it!)
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