I'm sorry for this very basic question but I know that plumbers deal with pipes, electricians deal with wiring, etc. but what is the name of the kind of sub-contractor that can cut a make a pass through window in a wall that the kitchen and living share? A carpenter?
If the wall you are dealing with has electrical and plumbing then you need a general contractor, who may sub out some parts of the job as needed to get the right specialties.
If it's just the wall w/ no wiring or plumbing then generally you need a carpenter and a finish carpenter or someone who does both.