gets the subcommands under the service name

        Parameters
        ----------
        ctx : Context
            the context object passed into the method
        cmd_name : str
            the service name
        Returns
        -------
        EventTypeSubCommand:
            returns subcommand if successful, None if not.

def get_command(self, ctx, cmd_name):
        """
        gets the subcommands under the service name

        Parameters
        ----------
        ctx : Context
            the context object passed into the method
        cmd_name : str
            the service name
        Returns
        -------
        EventTypeSubCommand:
            returns subcommand if successful, None if not.
        """

        if cmd_name not in self.all_cmds:
            return None
        return EventTypeSubCommand(self.events_lib, cmd_name, self.all_cmds[cmd_name])