Congratulations on joining the ranks of the paperless!
You can upload seperate gpx files into your PDA- i.e. if you want to add one (or 10, 300, etc) they will need to be spun as an new individual file and plucked as a new channel. For instance, I commonly spin and pluck seperate pq’s for the SE WI, Central WI, and Illinois. It’s handy when traveling as I then have seperate files to work from within the PDA. Not too convienient for adding only one waypoint, but next time you won’t forget that one anyway.
As for following a route, the easiest method is to use GSAK’s arc/line filter. You will need pq’s of all areas along the route. (You can open multiple pq’s in one GSAK database). Then you basically create a line between two or more waypoints that are known to be on the route. Then use GSAK’s filter settings to filter out all caches that are outside “X” many miles from the line you created.
The instructions are better than most programs- http://gsak.net/help/hs4025.htm
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