need little help with items :)

need little help with items :)

i'd like to make an item trigger (or not trigger) that will change 2 items into one 'other item' or just like it was in campaign (NE) : when u pick item of same type as u have in you inventory - its lvl rises and so are bonuses

i tried to do that myself but i dunno what to start with ;/

Check this tutorial-map made by VampireKB/MrMaestro.
http://www.wc3sear.ch/?p=Maps&ID=2757

It contains some triggers for item-combination. You should be able to figure out your trigger after looking at these.