how to combine item?by creating item skill?

how to combine item?by creating item skill?

how to combine item to a new item,like dota chaos.
example:if i wan when i hav 2 healing potion,it will automatically combine to 1 greater healing potion,how can i set it,by item skill?

(soli my english is poor,hope u all can understand my questions n help me,thnx)

Please make the effort to type those last couple letters.

So you want a skill that triggers a recipe? This is how I could do it. You need this trigger, a dummy ability like roar, and such

Event
Unit Starts the effect of an ability
Conditions
w/e
Actions
For Each Integer from 1 to 6 do actions
Loop-If triggering unit has item of type potion of healing in slot (Integer A), then set RecipeTemp to (RecipeTemp+1) Else do nothing
End Loop (not a function)
If RecipeTemp Greater than or equal to 2, then remove all items of potion of healing, create a PoGH for triggering unit
-Special effects

Why would you wanta dummy ability? Do:
Event-Unit Acquires an item(generic unit event)

Oh, he meant dota recipes. But don't even try to make another dota. I will cache ban you if you do that