I'm interested in seeing if this can be done in Shopify. You can can do it in Big Commerce with a bit of fiddling. Shopify Multi-Product order forms nearly do it, but I can't find a way to limit a customers selection to, 3 out 6 or 7 out of 10 products
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No I haven't found anything like this in Shopify, which is a shame as it would be useful for me. As Shopify only allows three product options I don't see how it could be done, I'm leaning more towards this being a Big Commerce site