This should be included from Shopify. Third party apps slow the site down, cost money, and risk data loss.  Not interested in paying you more than I pay Shopify monthly. 

Not yet. I am still looking for a solution to this. I did find a dirty and rough way to do it in bundles but have an issue if I want to advertise 2 colors of shirts that have 2 DTF (black for white shirt and white for black shirt). The shirts that I ...

We are also having this issue. 

Same issue here. Has a solution been provided? 

I have this same dilemma. Did you receive an answer? 

I am also having this issue. We have raw materials (blank shirts and DTF transfers) and want to not oversell. Is there a Shopify solution for this? The third party apps cost money and they have horrible reviews.