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Product Inventory Sharing Stock

Hi, I have a site for a cookery school, where attendees are given the option of Standard or Allergy Free ingredients for any given lesson.

I am therefore setting these requirements as variants as Allergy Free has a small additional cost to the customer

With each lesson there are 10 total places available, however I cannot see a way for the lesson options to deduct from the same stock pool. Meaning I have to manually reduce overall inventory, otherwise there’s effectively 20 places available.

Has anyone got a solution or workaround for this?