Hi @gsisports, thanks for bringing this up.

We don't have an exact inventory setting built into our current Item Library that would allow you to simultaneously count down multiple items as you've described.

If you haven't considered it already, you might try using modifiers for your various designs. This should allow your customers to pick their design and t-shirt, yet allow the inventory to properly reconcile. You may also want to have a look at RCT's suggestion for tracking inventory and modifiers.

Hope this helps. If this doesn't hit the mark, please let me know and I'll be happy to have another look. 🙂