I've found it's easiest to
work with GPX files. From the early days of
GPS, I've always had multiple
GPS receivers and wanted to share waypoints and routes between them.
OpenCPN is just another tool which allows me to view, modify and create GPX files full of routes and waypoints. The raw data is the GPX file, not whatever
software I happen to be using it with at the moment.
So, export to GPX and fire up your favorite text editor. Preferably one which allows you to run scripts, macros or at least a robust "replace all" function. Edit each route, waypoint and route point to your heart's content. Once you've got a library of GPX files you can
import them into whatever device or app you want to use.
One thing I've found very useful is a little macro I set up in my text editor to prune out all the extraneous data that OpenCPN adds to the GPX file. All I really want in there is the name, lat/long, description and, for route points, the type.
For OpenCPN, the
type can be "WPRL" or "WPT." I
think you can just change the
type to WPT and
import. But it's been a while, you should probably look it up to verify.
Once you've learned to manipulate the GPX files, you'll find a thousand ways to streamline your route planning.