Multiple versions of same product. Inventory issue

Hi there


I use square for our inventory system for our pub. When we sell wine we sell it by small medium or large or bottle. 


Is there a way to have sub items come off inventory as an overall. 


At present what happens is, say we have 20 bottles of a particular wine. We sell 96 small measures which equates to 16 bottles but we can only track the small measures, not the fact we have only 4 bottles left (it will still show 20 bottles)


is tgere any way of linking these so that we can set multiples (ie 6 small = 1 bottle off inventory)?

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