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Select the Items tab and click on the Edit enum button.
Click the + button to add an item, write the item name, and click save.
Open your prefab. In our example, we made a prefab out of the default cube.
Add a Savable item script to your prefab and set its value to the newly created value in step 2.
Set Tag and Layer to your prefab. In our example, it will act like another obstacle so we set Tag to Obstacle and Layer to Interactable.
Get back to the Items tab and set a prefab reference.