Hello,
I want to make my NPC own some NON REMOVABLE item in their inventory.
Even the player will not be able to remove them (ot they can respawn).
Can anyone teach me plz?

If it is a cloth, weapon or armor uncheck the "playable" box and he player will not see it and will not be ale to take it.
If it is a misc item, making it unplayable will have the same effect, except it will not be equiped on the character.

Actually I wanted to give Aparratus, Scyth, and other items that are being used in packages.
Also I wanted to give them "UnRemovable Food & Drink" so they will have always food in their inventory
Finally I wanted to make an "Unremovable dagger" to use it on trainig lackage when they dont have other weapon.

Try to give them "-1" times into the inventory. Then they should never run out of them ... should esp. work for food.
But I don't know, if this works in cases of stealing and corps check.