I don't think you can arrange repeats in that way. If I am understanding correctly, I think you might be able to achieve your result like this:

One song, 96 bars long.

Set the Style required for the first song.
1-16 bars of Part A
17-32 bars of Part B
At bar 33, use Function key <F5> to change the style required for your second song
33-48 bars of Part A
49-64 bars of Part B
At bar 65, use Function key <F5> to change the style required for your third song
65-80 bars of Part A
81-96 bars of Part B

I'm not sure if you require a segue between songs, if so you could add bars as required.

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