How to run ArmA 2 High Command in multiplayer Dedicated Server
For basic info ArmA 2 Editor Modules, High Command.
Place high command commander module (F7), sync it to player character (F5). Place high command subordinate module, sync it to all the units you want to command.
Finally and here is the important part, sync commander and subordinate modules.
Now your high command mission will work in multiplayer in dedicated server as well as hosted server.