There is always the converter Tag - filename.
The converter uses tags as variables and alphanumeric input as constants.
This helps you to construct really complicated filenames - if you like.
E.g. a filename that follows this pattern ...
radioplayname _ Story1 p.1
...
Radioplayname _ Story2 p.2
Would group together the tracks of one radioplay.
The corresponding mask would look like this:
%album% _ %title%
This Mask is ok as you have added a numbering scheme to your titles.
Now, if you do not have this, you can append the track number:
%album% _ %title% _ $num(%track%,3)
You can always revert to another numbering scheme with the numbering assistant and the superb formatting actions in mp3tag.
I suggest that you use the converter as a start as the dialogue has a nice preview function