Hello, you can pack the image files per folder by choosing Image folders:
Texture packing - Spine User Guide: Packing during data export
Packing settings can be configured for each page by placing pack.json in each folder:
Texture packing - Spine User Guide: JSON Configuration
If the images you want to pack on separate pages (hair, clothes, etc.) are currently in the same folder hierarchy, you will need to modify the image paths, but this can be easily accomplished using Find and Replace:
Tree view - Spine User Guide: Find and replace
After selecting the attachments you want to change the image paths, open the Find and Replace window, enter "^" in the Find field, enter the folder name you want to add before the images name in the Replace field, such as "subfolder/", check the Regular expression, set the Scope to Tree selection, set the Field to Path, and press the Replace button to modify the paths of all selected images at once.
If there is anything that is not clear, please feel free to ask!
