On the device:
https://www.mobileread.com/forums/sho...d.php?t=186305
Collections Manager
Version 2.3.6
Are you looking for something to manage this on the PC?
That would be Calibre, I believe they plug into each other to facilitate simplified "both-side" management, it's not something I "do" however, so that part is anecdotal.
One would need
https://www.mobileread.com/forums/sho...postcount=1760 I belive to do that part...
Hope that helps