Check this Item system.

Here is my problem: I don't know how destroy items required to make item in this case I wan't to destroy Gloves and Ring of Regeneration and make Ogre Belt.
Second problem is annoying - when I create Ogre Belt instead of 1 there is 5 items.

1) Use Item - Remove (Item Carried by hero of type)
2) Do you mean 5 charges o 5 instances? Lasts the problem after application of point 1?

I meant when I use Hero - Create Ogre Belt and give it to (Hero manipulating item) then it makes Ogre Belt in any free slot in inventory and crates one more on the ground at position of hero. :/

I guess you haven't applied Item - Remove. This is what the script IMO does:

1) Hero acquires an item and runs the event
2) He has both items required -> it creates the belt for him
3) The trigger is ran again (incoming belt trigger the event)
4) He STILL has both items required -> next belt is created
5) The trigger is triggered again...

Ok no more problems Item - Remove (Item Carried by hero of type) resolved 2 problems.
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Yeah I've recogniezed how dumb was I :P. Thanks for help.