Hello,
I have products that may require additional accessories to be purchased.
I've seen some shopify sites have OK functionality in adding accessories, but none like this:
http://www.2modern.com/products/pensi-aluminum-fan-1
For additional accessories you also see an image.
What does it take to create this type of functionality? Is it difficult? Is it expensive? Is it an app? I'd like to use it for my store later down the line.
Thank you.