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Thanks for helps
You can do that by entering the “Model” Tab and pressing “Negate” while having the Part selected.
You can’t just create a negative part as far as I’m aware, not that there’s any real reason for it ingame. However if you want to create Unions live (in such a way that holes can be blasted through walls) then SubtractAsync() might just work for you 
It allows you to create unions in the same way you would with negative parts in roblox studio. Hope this helps
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