What type of action are you suggesting?
I'm sorta doing the same thing as Jaga but I'm modifying the composer field.
Action type:Format value
FILE: C:\MUSIC\Touhou Music Collection[3S Cubic][3SCD-0002] 地平線のむこう側へ\3S Cubic - Border of Life.mp3
For composer I want to use the information that's one folder(?) up, in this case it would be [3S Cubic]
Jaga want's to use the folder that the MP3 is in, in my case it looks like I want to use the one that is up one more directory. If i use the mentioned action type plus your suggestion (%album/%dummy%) for format string, it looks like it is pulling the information from the album field and adding a \ next to it.
Florian's section for "How to import parts of the folder structure into the tag?" doesn't quite make sense to me. Florian gives an example of a path and shows a quell txt below it of what it I think would be in "tags". I think I'm misunderstanding something or totally looking at the at a wrong perspective. I'm new at this as well. I would like this to work in my entire collection as well so all the information I want to import into the composer section will be a directory up and not the directory that the MP3 is in.
Are you guys using a different action type?