Hi Yammyfan,
there are 3 ways to play a song with 2 (or more) styles:
a) Manually change between the styles.
In that case make sure that you have "Tempo Hold" on the keyboard's settings so the second style will always play at the tempo of the first style.
To find this setting:
Press the "Direct Access" button.
Now press something from the style section row e.g Main A.
On the screen you will see some settings.
Select Tempo Hold.
The tempo will be reset again only if you press the stop button and then choose a new style.
b) Use Registrations
Eg.reg button 1 has the Main A of the style "ONE" and reg button 2 has the Main D of the style "TWO".
When you have made a registration with differnet styles you can move between the reg buttons,the style buttons and the OTS buttons as long as you remember what everything is changing when you push it
c) Use the Assembly function of the style creator and combine parts from 2 or more styles to create a new one.
This takes a lot more time to do it and it doesn't require any technical knowledge.
It is just a Copy-Paste procedure.
The benefit of it is that you create a new suitable style for a specific song and you do not have to worry about the tempo and other stuff.