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Create a new file in the editor, go to the category you're modifying, and click New (Copy). While that menu's open, write down the unique ID of the thing you're going to modify (it'll be in parentheses), then select that thing, and enter that unique ID in the "replaces thing ID" field on the middle right of the screen.
Now, you can make any modifications you want (you'll need to give it a different unique ID, BTW), and your changes will overwrite the old thing (but if you make too many mistakes and have to delete it, the original version still exists).
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