I just looked at the standing torch for an example, but I think you’re looking at the wrong file to do what you want. “Components” is only available on meshes or models, actual in-game items.
Open the blueprint for the item you want to modify, go to components, and if it has an inventory, you’ll see it somewhere in the components list referenced as something along the lines of “PrimalInventoryBP_blahblahblah”.
Now, that references a blueprint and isn’t a physical item, so if you want to specify your own inventory you need to delete the current inventory, then “Add Component” and search for your PrimalInventory that you want as the new inventory.
-WM