Pre-Order button for variants - allow to overbook items

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Hello Folks! 

We have been asked by one of our clients to develop a custom application to handle pre-orders as there is no app that works as wanted.

We have been asking ourselves how to do this, but can't figure it out 100%


Here is the requirement:

  • A product in our store has multiple variants (T-shirt size)
  • when going to the single product page, you get a list (dropdown) of all variants
  • If a variant is Out Of Stock (OOS), it says "Pre-order" as a tag close to this variant
  • If clicked on that variant, a modal opens and you can add it to the cart as pre-order (this modal also contains a date and has some extra logic to it, hence the need for a custom app)
  • The customer can purchase like with any other product and fulfillment happens after


  • Now, we are stuck with the fact, how we can allow customers to overbook an item while still showing the pre-order button
    • We are aware of that "checkbox" in the product variant setting to overbook
  • We are not sure how to get the same dropdown of variants with the indication of whether some of the variants are on PRE-ORDER


What do you think?