What is the Difference between the following Item Types.

[Lienn]

Enhanced Items
Finished Items
Parts
Materials
Decorations

Enhanced Items: Items that are made from another one, like bladed lantern shield or engraved iron Bhuj.
Finished items: Stuff ready to use, like meat dishes, weapons and armor
Parts: Materials that are part of a big one, often marked as weapon part, footwear part, etc. Some examples are outsoles, vamps, sleeves, hafts, grips, etc.
Material: Anything that is neither food or finished item. Plates, squares, ingots, leather, cloth, yarns, lumbers, planks...
Decorations: Its for accessories i believe.

And you forgot mass production, that is for items that you make more than 12, like nails, rivets, arrows...