Where is the location for the folder / files for Movie Sets?



When i refresh a Film, it sometimes gets dumped into a movie set, or i sometimes need to create a movie set of my own
so for instance i have (amongst many others) two custom sets, one for “Herzog”, the other for “Herzog/Kinski”
where are these custom items stored?
Also, where is the automated movie set list created – i need to change all of the ones that get created as “THE BlahBlah Collection” to either “BlahBlah Collection, The” or even just “BlahBlah Collection”
Yes, i know i can do it one at a time by editing the title, but it would be much simpler to do this at a folder level
I use Flash Renamer as a bulk renaming utility – this moves, cuts, numbers and adds file and folder name parts in a batch process, thus saving me enormous amounts of time and giving true consistency

nearly forgot – if these liists are in files, i would need their location and names – as i can edit the file in MS Word