go into the minecraft source file(windows=Run-%Appdata%-->.minecraft/mac=finder-->Username--> Library--> application support-->minecraft) then go to saves then your world and copy the level.dat file to the desktop. go to minecraft then put all items into your chest. save and exit, then quit minecraft.replace the new level.dat with the one on the desktop and there you go, duplicated items!
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to rename items
Placing items in Minecraft is usually done with the right mouse button.
Not including potions, there are 300 items and blocks if it isn't modded.
It holds items like a chest
Sorry it's probaly not possible ):