There is a "howTo" in the FAQs that describes how to import data from the folder structure:
could be imported with
Format string: %artist%\%year% - %album%\CD%discnumber% - %myalbum%
If you want to have a special format in a field that you have to modify that field after you have imported the data.
If the data is split across the full filename, use a helper field like %myalbum% and merge it after import with an action of the type "Format value" or Convert>Tag-Tag for the target field ALBUM with the
Format string: %album% (%myalbum%)