You cant copy data from other maps, so you will have to manually recreate and redraw each region. (or get Flesius9517's original files)
To help you get going with making your own maps, check the following tutorials:https://www.youtube.com/watch?v=AkQn1pIZdY4https://www.youtube.com/playlist?list=PLSmZ4VbaICL_Y2e6xgXkyU7jabJsh6HLs
The wiki (https://www.warzone.com/wiki/Map_Making
) is obviously the first place to look for info.
If you want to go make maps, you should also join the Mapmakers Discord, since its much easier to help that way: https://discord.gg/cxwzG3uA