Ask for Live and let die

[Timonel]

Hello everyone, I'm trying to put together a style for Live and let die and put the variation 1 and 2 "Piano Ballad", in the 3 and 4 "70s Disco1", the question is that the tempo of variation 1 and 2 I need it in 64 and that of 3 and 4 in 90. Is there any way to do it in style, or I must directly use a register to change the tempos. I did the work on a PSRS670, I also have a 950 to try something.
Sorry my English-Google.
Thank you.