Activate the cheat/test mode in the game and use give or spawn and the insert code of the item. The give command will insert the item in the inventory and the spawn command will insert it in front of the hero. But you should not use give with npc's or large items. For those use spawn instead.

[Amulets] - [Perks] - [Trophies] - [Armor] - [Body parts] - [Magic] - [Animals]
[Food] - [NPC] - [Objects] - [Packages] - [Plants] - [Recipes ] - [Rings] - [Shields]
[Keys] - [Trinkets] - [Writings] - [Teleports] - [Potions] - [Weapons] - [Tools]