add empty items to table "item_template" , this items can use and dont need modify DBC
Question: How many empty items are stored in item.dbc? Answer: TBC = 6498 Wotlk = 8543
Question: What base are they suitable for? Answer: For any database where "SoundOverrideSubclass" is present
use HeidiSQL database editor , just execute to your World database "item_template" .
before installation make a backup first