In addition to what Mac said - btw: thank you, Mac, for the huge number of all your helpful contributions on that forum! - I do the following:
First I came up with my own set of categories that fit better to my personal way of making music with BIAB. I copied the lines of the styles I could imagine to use in the future into my new categories. Some styles I copied into 2 or even 3 categories. Thus I'm sure to find this suitable style when I would need it. (You may consider these as 'corossover styles'). I did this more than 10 years ago when I began working with BIAB.
Everytime since I then when I upgraded to the newer version - and I did this regularly - I rehearsed the new styles and added 'my favorites' to my special sub categories. Again - some styles fit to 2 or even 3 sub categories.

Since BIAB offered the option to mark favorites this also was a great help. This option is much easier, but for me my own set of categories is a even more effective system.

When the Realtracks came up I started a additional set of categories for the RTs.

For me these 2 own systems are very effectiv. But it takes a lot of time to keep it actual when a new version of BIAB comes up. But when you want to work effectively - for me(!) this is the way.

In the following I give you my(!) system of categories.
It's without the thousands of lines with the actual styles information. (Would be too long in this post).
But you get the idea of what I'm working with:


~~~
~~~

~My FAVORITS:
~ Folk & Country
~ Ballads: Pop & Country
~ Pop & Rock
~ Gospel & Church Hymns
~ Praise & Worship (Set#18 & 52)
~ Ethnic
~ Reggae, Caribbean, NewAge
~ Contemporary
~ Latin, Salsa & ClassicDance
~ Modern Dance
~ Fusion, Tek, R&B
~ PianoSpecials, Banjo, Shuffles
~ Jazz, Blues & Soul
~ Vint-Jazz (peppig)
~ 3/4-Takt
~ 5/4-Takt
~ 6/8-Takt
~ 9/8-Takt
~ 12/8-Takt
~ 2/2-Takt
~~~~

~REALTRACK-Styles:

~ SPIRITED Acoustic & 12String Guitar [RTs#49,98,150]
~ PRAISE & WORSHIP: Shinig,Uplift,Power,Believe [RTs#116,117,134,135,151]
~ COUNTRY & FolkSwing [RTs#65,81,97,101,118,121,132,133,136,139,141,149,154]
~ Ballads & More [RTs#61,137,150]
~ POP-ROCK-Crossover: Piano, Organ, Harmonica, Bass
~ (12-)Electric Guitar [RTs#87,88]
~ Rockin' - Folk, R&B, Country & Others [RTs#41,43,45,60,68,71,83,85,105,108,150,152]
~ Blues Rock [RTs#86,137]
~ WALTZES: Pop, Rock, Country & Jazz [RTs#58,63,64,76,76,82,96,99,107,126,148,153]
~ STRIDE, MemphisSw, BOOGIE, DIXIE & More [RTs#77-80,137,139,143,144]
~ 70s Soul, Boogie & Texas Rock [RTs#42,122,138,140,149,154]
~ Blues Guitar & Organ [RTs#44]
~ Western Swing & Bluegrass [RTs#62,100]
~ Uptemp Reggae & Calypso Pop [RTs#102,103,106]
~ Celtic: Hornpipe, SlipJigs [RTs#104,123]
~ Gypsy: Jazz, Latin & Waltz [RTs#109,110,128,129]
~ Ballroom:Bossas, Latin & More, Fast Samba [RTs#50,51,52,74,75,147,148]
~ Smooth Jazz - Swing, Ballad & Pop [RTs#72,73,91-95,111,112,127,131,138,145]
~~~~


This is part of the (beginning of the) original file BBW.LST.
When my system shouldn't give me a satisfactory styles for a special song, then I still have the possibility to acces the 'normal' BBW.LST-category. (Remember: My set of categories are only a selection of all available styles. (But the selection is a lot of thousand, too).

Hopefully this post can help you, too.


Greetings from Germany

Ulrich

P.S.:
I didn't re-categorize the new RTs of version 2012.5 yet. I'm playing on my new Yamaha Tyros keyboard more than with BIAB. (You can spend your time only once ;-) - that's why the RT section doesn't include the newest RTs yet.