Hi
I’m selling limited run posters, in three sizes. I need to be able to have a total of 100 of a given poster design available, and this number needs to drop regardless of which variant the customer buys.
So if I have 100 of poster A available, and someone orders 1 large, 1 small, then I should have 98 left.
Currently I seem to only be able to have 100 available of each variant, or 33 of each variant. Neither solution works for my purposes.
Does anyone know of a workaround or extension/plugin that can solve this issue?
Thanks!
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Option A
https://apps.shopify.com/mechanic
+
https://tasks.mechanic.dev/sync-inventory-across-product-variants
Option B
https://apps.shopify.com/stocklink
Option C
https://apps.shopify.com/bundleup
Option D
https://community.shopify.com/c/shopify-apps/having-multiple-products-draw-from-same-inventory/m-p/1050675
(wait for @aosoble to finish his new app)
TLDR: These are all hacky ways to accomplish this, and there really isn’t a great way to handle having multiple variants sharing the same inventory count. What I would recommend is either: only offer one size/variant for the product, or else turn off inventory tracking entirely and then manually track how many you’ve sold … then turn the inventory back on and set it to 0, once you don’t want to sell anymore.
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Thanks a lot for your detailed reply, very appreciated! I’ll have a proper look when I get home, and I’ll report back with my findings. Cheers 
I built a workflow similar to this here:
https://www.getmesa.com/blog/manage-inventory-for-size-based-variants-that-are-cut-from-eachother-demo/
Actually that one is quite a bit more complicated - should be able to build what you’re looking for pretty easily if you’re open to a 3d party app.