How would I remove one of an item type from a player's inventory

[TheKillerBunny]

so I have a loot box system that will give you a random item then remove the loot box from your inventory, but I can't figure out how to make only one loot box be removed

 

[ARMcPro]

Player Action: Remove Items should remove 1 item if you put only 1 of that item.