How combine two Items?

[Cranky Old Man]

Inventory hps file?
What's this?

I quote MrBigzy:
"You make your own inventory.hps and put it into you main directory for
your custom story. The name of the script is read by the engine and is
used specifically for inventory stuff."

I guess you'll need a separate "inventory" script file because you'll want to be able to combine these items within *any* level of the game.