How can I have a basic inventory system and spawn an item when I call a function?

Development Pipeline & Plugins Editor Scripting
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Make an Array of Type Class Actor. Set your ItemsClasses manually in that Array (Your Item Blueprints).
Make your inventory an int Array. values inside array are indices of ItemClasses array.
If you want to spawn Item from your Slot 0 of your Inventory array, get Int Values of that slot and plug it into Indexslot of ItemClasses Getnode. Than spawn this class.