Its possible make this?

[nck1990]

I can create just a character like dota but In this character unit create many red cross. the Interface of fusion items or items have 12 slots. So I can make 12 red cross and take the items, push the items inside of 1 red cross,2 red cross,...,12 red cross. And fusion items like dota

 

[PublishedShadow]

I'm not 100% sure what you are trying to ask and I do not play dota, but it sounds like they are using the spell book with different abilities inside of the spell books. They aren't technically items inside of the "crosses" rather, when the abilities are used, you recieve items.

So yes, this in theory is possible with spell books and triggering.