Above are the thread categories I created.
I clicked on So-Fine and can see Fern is getting low. I entered that it was "low".
This is the list of So-Fine that was created in Fuzzy Inventory of all the So-Fine numbers & colors. I can list if they are getting "low", or if I have "none" or "some". I use the term "some" to let me know I have an adequate supply of a So-Fine color. The yellow bars showing next to the colors are showing me Rose Petal, It's a Girl, and Fern are getting "low". Green bars mean I have an adequate supply for the time being.
I've just started using Fuzzy Inventory, and I'm sure there are other options for listing categories and sorting them. But, with keeping it simple in mind, the "add Fuzzy Item" option works the best for me when it comes to threads. "Add Quantifiable Item" is another choice that can be used. Neat App! and it's free!