Oh yea, I guess there are even more tips.
As you add fields they don't get assigned to a country. Just make sure the field is assigned to the Zone you want, is Field Owned, has a Field number, and the Object Type is Group Master. Once you have added some fields, click File/Save and then Exit the Terrain Editor and click Yes to save changes. Restart the Editor and open your map. Then click Settings/Field Setup and you will see a list of all the fields. If a field is not assigned to the right country, select it from the list and change the Original Country to the correct country.
The Zone Tab shows all the fields and what zone they are assigned to. Each zone has to have one and only one Zone Master. Put a check mark next to the field number that will serve as the Zone Master and remove any other check marks in that zone. The Zone Master controls which country the strategic elements such as Ammo, Barracks, etc. in that zone belong. The exceptions are Zones 1, 2, and 3. The HQs are the Zone Masters for these zones. To set the HQs as Zone Masters, go to the Objects Tab, click Shape in the Select Objects section, select HQ0 from the list and click OK. All the HQ objects will then be listed in the Selection List. Double click the first one to bring up the Object Properties window. Object Type should be HQ, Field Owned should be Unchecked and a Country number (1, 2, or 3) should be there. The Zone number should also be either 1, 2, or 3, and the Is Zone Master should be checked. Click OK to save changes and then do the same for any remain HQs in the Selection List.
The last tip for now is to always Save/Exit/Restart/Reopen the map before the Build. Some of the files do not get updated until exiting the Editor. Also, limit your terrain names to 8 characters or less.
And yes, the help file need more help.
Merry Christmas
MachNix