Import preplanned route into the 8.4n?

[UPMedic]

I'm planning a road trip, and I was wondering if there is any way to import a preplanned route into the Garmin 8.4n GPS?

I know you can go through the actual touchscreen itself and select "Route" and put in a start and end point. That works, but does anyone know of a way a route can be loaded off the USB or off a CD-ROM?

If I simply put in my start and end points on the 8.4n, it comes up with a route...but not quite the route I want to take. So, I can add additional "end points" (or via points as I like to think of them) to make it take the route I want. That's a bit tedious, though. I'm looking for a better / easier way.

Thanks!