extractable items

I want to begin work on extractable, items, such as sealed talisman of longing, and armor pouches.

These items produce an item when double clicked. The current configuration from the server files use a skill, and another xylophone file that holds the extract information.

My question is how are the skills assigned to each item.

Example item #6007, has a skill # of 2174, how was the skill I'd assigned.

I want to know this so I can begin work on important items in game, but i don't want to use the incorrect skill #.

Thanks for your help.

It was suppose to be "another XML", not xylophone, lol