| I personally don't know how switches work either, however I can help you with the unit creation triggers.
If you want it so when you build a Ghost, it turns into a hero ghost, try the trigger...
Current player creates at least 1 Ghost at Anywhere
Remove exactly 1 Ghost at Anywhere
Create 1 Hero Ghost at Location 0
Preserve Trigger
I don't know if this is the best method, however it would allow you to have players make hero units this way. You can restrict this trigger to only certain players as well, making different countries on WWI maps have more diverse armies.
I'm going to move this to the Use Map Settings forum, with a redirect in the StarCraft and BroodWar section so this thread will get the most responses.
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