Song(with midifiles) import in existing mix-template on other Mac with S1?

I like to import a song(recording with midi & wav files) recorded by someone else.

They asked me to mix it in my studio,and i like to mix it with an template i set up for this purpose.

because i make regular mixes for them.

So how do i import the song in my template , especially the recorded midi instruments ?

Mac PC & studio one 3.5.1 are used on both systems