It overrides L1 items with a rupee item, L2 items as a heart item, and L3 as bombs. I'm not sure what later levels result in, but it's really not important-- It's not only shown in the subscreen editor, but it also applies to gameplay.
[809] Item override overrides with the wrong items.
No, no, no. You put the ITEM ID number in that box, not the level!
...
Oh, who'm I kidding? I guess I'll have to make it into a dropdown menu or something.
could you make it so you can click in the box to edit the value AND to have a aroow next to it to select from a dropdown list?