Hey, im the creator of the greenland package, is it possible to combine them after i have made them individually?
I'm sorry, but I think putting it all in a single package is a horrible decision. What if someone else makes a better version of a single airport? Now you have to choose between a full package or a single airport.
Sure you can mess around with the priorities. (which is really ugly to do, since it only works alphabetically for now)
But even that will lead to issues if you have 3 packages in the same area and all 3 are best at 1 item and worst at another.
(no offense to the Greenland package though, he provides a package as well as individual airports 
)
I always keep each file separate but if they're designed to work together each folder will start with the name of the theme so people can find it easily.
timot75 if your problem is that you community folder will get full of thousands of addons, I really recommend MSFS Addons Linker by bad2000: https://flightsim.to/file/1572/msfs-addons-linker
Now your problem will beome: how many GB's of addons am I willing to download? 