I'm making a map and i only want the dozer to be able to build a barracks and repair buildings,how do i do that?

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If you wish american dozer build some unit that only you want to create just make a map.ini by using notepad or special text editor like context and notepad++ then paste this in your text editor.

CommandSet AmericaDozerCommandSet
1 = Command_ConstructAmericaPowerPlant
2 = Command_ConstructAmericaStrategyCenter
3 = Command_ConstructAmericaBarracks
4 = Command_ConstructAmericaSupplyDropZone
5 = Command_ConstructAmericaSupplyCenter
6 = Command_ConstructAmericaDetentionCamp
7 = Command_ConstructAmericaPatriotBattery
8 = Command_ConstructAmericaParticleCannonUplink
9 = Command_ConstructAmericaWarFactory
10 = Command_ConstructAmericaCommandCenter
11 = Command_ConstructAmericaAirfield
12 = Command_DisarmMinesAtPosition
End

remove every line starting from 1 to 12 except the number 3 cause americanBarracks is in there.Then save as map with .ini file extension.