Tie all variant quantities to main product qty?

I'm setting up my site to sell paintings, and generally I will be selling them unframed. However, customers have the option of adding on a frame to any given painting. I was planning to use variants to handle this in HikaShop. For each painting there would be the normal unframed variant but the customer could also select the framed variant for a higher price. I have no desire to sell frames by themselves, and I don't need to provide any details about the frames, so I don't want to have frames listed as products. This seemed to be a great solution. However, only one of each painting is available, regardless of whether it is sold with or without framing. Is there a way I can tie both variants' quantities to the main product quantity so that if I sell the framed variant the unframed variant also goes out of stock?

Hello,

You'll maybe find your answer here

Hope this will help you.