class CmdWhatever extends FCommand {
	//Whatever
}

public void addFactionsCommand(){
	FCmdRoot cmd = null;

	P factions = (P) bukit.getPluginByName("factionsuuid")
	Class<?> factionsClass = p.getClass();
	Field[] fields = factionsClass.getFields();
    for (Field field : fields) {
		if (field.getName().equals("cmdBase")){
			field.setAccessible(true);
			cmd = (FCmdRoot) field.get(factions);
			break;
		}
	}
	if (cmd != null){
		cmd.addSubCommand(new CmdWhatever())
	}
}