I am wondering if there are any apps that enable multi lines purchases.
For example a book seller, there are Spanish language books from level 1-12. If someone goes on to any of the books in that series (they are sold separately) they will see a list "other books in the series" from levels 1-12 and from that they can add 20 copies from level 3, five copies of level 6 and 18 copies of level 12 without leaving the "product page" page.
So they can still purchase one item by itself with a normal add to art but if a class teacher goes on the site they can buy for all levels on the same page.
Kind regards and much thanks in advance for anyone that can help.