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We’re building a new Magento store for our (mostly free) educational materials (booklets, DVDs, boardgames). Many of the booklets have a student- and a teacher-version. We would like to make sure that when a school orders the teacher-version, they also order at least 10 student-versions.
As I see it, this could be implemented two ways:
1. When a teacher-version is added to the cart, automatically add 10 student-versions .
2. Upon checkout, check if there are enough student-versions in the cart. If not, show a notice: “You need to order 10 or more of [link to product]”.
How can we achieve this? Is there an extension that can do this?
Any and all help is welcome! Even just a push in the right direction!