Relating to your topic ...
/t/12704/1
Because you have already learned to use the converter, you have tagged the tag-field DISCNUMBER with the CD number and the tag-field ALBUM with the album name, from data given by the folderpath and the file name, now you only need some knowledge about concatenating the discnumber to the existing album name.
See FAQ area:
Actions
Write the tag-field ...
ALBUM
... using the format string ...
%ALBUM%' CD '%DISCNUMBER%
DD.20120122.0045.CET