hmmm... it's possible with events, but I'm thinking it will be easier to get a script for it. You'd have to design a scene if you want it to look nice, and so unless you are good with events and bored, your best betis to get a script. I think there might be one SephirothSpawn made. Check at hbgames.org
It's also possible with my Grid Inventory Script, but that is way too much if alal you want is the stashing system.