@Harald Sorry for late reply.
In short, I have created a paper doll system using spine that covers eyes, mouths, hair, eyewear, hats, outfits and even full heads. What made it a bit more complex is the need to recolor skin and hair.
So I have created a separate material for skin, hair, eyewear (needed their own material to control transparency of glass material), a material just for full heads, and lastly for full avatar without those.
The algorithm dynamically picks up slots using prefixes in spine slots and assign them to the correct material that gets recolored.
The atlas got bigger due to the introduction of full heads paper doll. Full heads are big.
So what I really want to do is create two png exports, one for all of the avatar and one just for the heads.
Currently our Spine image folder has two main folders full heads and avatar.
How can I export properly two have two png atlases one for each folder and ofcourse with the correct binary configs export.