Are you thinking of something like Ree Drummond (The Pioneer Woman)'s pantry?

Like this? Bottom shelf of the top section is a drawer with HD drawer guides. Top shelf of the top section is a standard adjustable shelf.

I am thinking more of the Pioneer's Woman's Pantry. I just discovered that I have a ton of wasted space above the ceiling in my pantry, and I think going upward might be a very nice space addition to my home. Thanks!

I need pics since I have no idea what you have a 2 storey pantry unless you have 2 storey ceilings in the kitchen so post a pic here in a comment DO NOT start another post. I do not like walk in pantries unless they are very carefully designed to be in the work area and cannot imagine climbing a ladder to get at stuff in the pantry. I find most people store too much stuff in pantries that gets out dated and lost . I like true pullouts where everything is visible all the time.

"I find most people store too much stuff in pantries that gets out dated and lost."

^^ This. I mean, unless you're feeding a butt-load of people on a regular basis or run a food business out of your home, how many back-ups of stuff do you really need? And most food items do have an expiration date.

Mrs. Pete, thank you for the advice. There are really no pictures worth posting. All I have is a small room with an 8' drywall ceiling right now. Above that drywall ceiling is maybe 6' of space. I will have to punch a hole in the drywall to see what exactly is going on. My house has several slanted roofs (modern design).

Tall pantries that can be accessed only with a library ladder are not a useful as you might think. The only things you can store above your head are things you don't use often and that are small enough and light enough to manage with one hand. The other hand should have a firm grip on the ladder handrail -- unless you are an acrobat.

But, since you have 14' to work with, why not explore the idea.

I think I would build a 30" catwalk about 7' from the floor on all four sides accessed by a stair rather than a ladder. Still not convenient storage, but a lot safer.

For the rules of pantry design, see Pantry Perfect: the Can't Go Wrong Pantry Design Rules.