[asheshouse]

You need the Map Modding Tools to access FMB Map Editor.
(The link is inoperative)

Use cut and paste as described earlier in the thread to copy an existing airfield, with all its taxiway routes.

Then you can edit the copied version of the airfield to give it a unique appearance.

Now the tricky bit --

Only small maps will open in FMB Map Editor, so you need to use Actors Tools to split the actors.static file into small enough pieces. Work on the section you are interested in then re-combine the actors.static. Detailed instructions come with the tools.

Best start on small maps so you don't have to use the Actors Tools straight away. With large maps and an average PC it can take many hours to recombine the actors.static file.