Is right.
You can either use
MyWarcraftStudio or the
MPQ Editor the patches open and extract the individual data and then combine them into a new patch.
Where you have to be careful though because the files that are after in the correct path
Grou-/Kleinschreibung is in principle no matter. However, you can for example to get the path of item to write as item, item, etc to some structure and pack various categories in different subfolders.
How about
TextureComponents \ item \ Robe1_TU_F.blp
TextureComponents \ item \ Robe2_TU_F.blp
So do you have in the folder TextureComponets two subfolders item or item
However, orders to WoW in the paths Caps / a normal hierarchy, do not ask me around but exactly how. I have it tried it before.
Heiut: Have you in o.g. Example 2x the same files in the subfolders you see the Edit inGame was last loaded.