MS Streets & Trips is pretty good for planning trips. Files are exportable to the .GPX file format. All can be saved in any folder structure on the computer.
For me, I then put a copy of the GPX file on my Garmin 765t and import the route.
Now navigating and getting the GPS to work for you takes a bit of getting used to. The Garmin may not see what is planned as the best route. This is where unit setting need to be considered - fastest or shortest.
It's best to keep an awareness of where one is while receiving guidance. There are times I'll ignore and let the Garmin recalculate to fall in line with planned intentions.
Do put multiple day rides into separate files - Day1, Day2, etc.
For the most part, these two products work well together.