aircraft ground services........

Hi, i had fsx for 2 weeks now,
and i cant find out how to use the aircraft ground services,
i keep seeing pictures of planes with catering trucks, bagage belts, stairs and jet ways attached,
how do you get these to attach to your plane??
i know this question has proberly been asked loads of times before but i still cant find out how to do it,
any help would to greatly appreciated, thanks
and i cant find out how to use the aircraft ground services,
i keep seeing pictures of planes with catering trucks, bagage belts, stairs and jet ways attached,
how do you get these to attach to your plane??
i know this question has proberly been asked loads of times before but i still cant find out how to do it,
any help would to greatly appreciated, thanks