There is lots of ukulele support in BB. Here are 2 videos that describe what you can do from a ukulele perspective in Band-in-a-Box. (This same approach applies to other instruments like guitar, mandolin, violin, 5-string banjo, and guitars with non-standard tunings)
Ukulele with Band-in-a-Box Part 1
http://screencast.com/t/8zrPgQIDln 1. Using the “Tutor” to see ukulele chords on fretboard in any style
2. Playing a Ukulele style (MIDI) to see and hear ukulele chords
Part 2 of video on Ukulele
http://screencast.com/t/8bM45o68dr3. Ukulele Chord Diagrams (with any song any style_
4. Real Ukulele! RealStyles (e.g. Ukes140.sty) that have a Real Ukulele
Part 3: Putting it all together!
http://screencast.com/t/rF8aaAXUUsing the features taught in the previous videos, we show playing a Real Ukulele style (so you hear a real ukulele), and seeing/printing chord diagrams, and seeing on-screen guitar fretboard display using the guitar tutor
Hope this helps you get your chops together!