Combined inventory for variants across multiple products

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I sell phone cases in multiple designs, but they are made to order and the stock that I keep are plain cases with no design or customization. My listings are something like “Gold Phone Case” or “Pink Phone Case” and there are 12 phone model variants, like iPhone 13 or iPhone 13 Pro listed on each listing.

Is it possible for the variant inventory to sync? So if I have 12 iPhone 13 cases in stock, it will show 12 for both Gold and Pink cases. Then if someone purchases a Gold iPhone 13 case, it would show the 11 in stock for both Gold and Pink cases?