A plugboard puts the series name and number in the author field when you send it to the reader or save to disk.
This almost always makes it sort by series because the author is usually the same.
Works for both Sony and Kobo.
There is also a tweak for sony called Specify how Sony will sort collections which works for the Sonys
Mine is
sony_collection_sorting_rules = [(['author_sort'], 'series_index')]
Sony is better for collections than Kobo IMO because it sorts consistently and is faster accessing collections.
This post has a thumbnail and a better description
https://www.mobileread.com/forums/sho...db#post1647405