well Skude, following is from recent AJ post:
3. STYLE CREATION (Available as of OS4.0)
* You can create a style from scratch or build a style using style parts from existing styles (both factory and user).
* Select a User style and press EDIT to access the PATTERN EDITOR.
* Select NEW STYLE to create a new style from scratch or simply EDIT the current style selected.
* Here, you can COPY parts from other pre-existing styles into your styles.
* You can also copy their corresponding AUDIO parts (Drum, Bass, Guitar) or the Bass from STYLE A, GUITARS from STYLE B ...etc. It doesn't matter as they all pull from the same library.