Go to your baldur.ini file and add a line under [Game Options]:
Debug Mode=1
Then in-game, press CTRL-Space and type:
CLUAConsole:CreateItem("????????")
where ???????? is the code of the item. For example, wa2robe is the Robe of Vecna, sw1h51 is Celestial Fury, etc. You can find a complete item list at
http://www.gamefaqs.com/computer/doswin/game/30662.html Hope this helps!