There is another way all within BIAB.
1- Find the style you like with the Bsubstyle walking bass" and load it.
2 - Go to Styles menu | Stylemaker | Edit Current Style. Style Window opens.
3 - Click on Save As and give it a new name - ie "WalkBass".
4 - Choose "Bass" in the style window. You will see A & B substyles
You want to keep the "walking" B Substyle, and turn the A substyle into "walking".
5 - Click on the Style menu in the style window.
6 - See "Flip Current Instrument (swap "a" and "b" substyles) OK
7 - Then click on Import Instrument from Style - Fill in Bass | Bass | Replace existing patterns | (Check) B substyle, Ending, Drum Fills, OK - you should be sent to the BIAB root directory.
8 - Then in the BIAB directory, find the original style you chose, click on it and the B walking substyle will show up in your new "WalkBass" style in the B substyle replacing the A substyle you flipped into the B position back in point 6.

The key here is to make sure you give the style a new name befor you begin this swapping of A & B substyles. This should leave you with a totally "walking bass" style. Let me know if it works for you.

Cheers - Ian

In the words of PG - Have fun.

Ian
My "Original Tunes" Site
My gene pool needs more chlorine.