I think that should do it; this is Tyre used with an XXL IQ Routes Edition, which I believe was the follow up model to yours.
The route planned out with Tyre:
You can use the Tyre software (or a combination of Tre and Tomtom's Home software) to upload the route(s).
Go into the Tomtoms menu, and it should have a version of the screen below, with Itinerary Planning as an option, select it.
You should then be able to navigate to a list of stored itineraries on your Tomtom, in my case:
Once selected and loaded in, you then get the list of Waypoints, which force the Tomto to calculate your selected route.
Once this list is up, you can even tap on individual lines to edit them - handy if you find a problem while driving the route.
One other thing - if for some reason you miss a waypoint, and don't want to be directed back to it, select it from the list above, and on the following screen, mark it as "visited".