Add-on feature to products that do not effect quantity

Hello! 

I am a photographer with limited edition art prints looking to sell them framed and unframed. (my site is currently under-construction and i have a landing page live)  I understand how to create variants within the product page. However, where I am running into issues is defining the quantity. (see screenshot) If I list unframed quantity as 10 and framed quantity as 10 it will appear that I have a total of 20 art prints available when I only have 10. 

What I would like to see is a feature to "add-on" framing to the product and have it not effect the quantity. Imagining it as a dropdown option? The price also changes from framed to unframed so the feature would also have to take that into account.  I have chatted with Squarespace support and they confirmed this request is not available for products at this time. They submitted a feature request on my behalf.  I'm wondering if anyone here has any idea on how to achieve this option (plugin, coding, etc...) 

Thanks! 

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If I list unframed quantity as 10 and framed quantity as 10 it will appear that I have a total of 20 art prints available when I only have 10.

Without adding any custom code the only way I can think of to handle this would be to not use variants and set your stock levels to 5 each.

If you want to use code then take a look a Trunk. It's a paid extension. I've not used it but from it's description it seems as though it could handle this particular need. To be sure though you'd want to contact them.

I don't have any immediate thoughts on the rest of what you want to accomplish.

18 hours ago, StudioElixir said:

What I would like to see is a feature to "add-on" framing to the product and have it not affect the quantity.

Please see my answer in a similar thread: