I would start with blank 4/4 style and find a Piano Real Track (Ballad Type) that resembles the one in the song. The chords seem to be the straight ahead type for this song. Some change on beat 3 and others on beat 4, might wanna mark those from the lead sheet.

Once I have the Piano part finished, I would start building the bass line and strings. They stand out in this song. The bass does not play on every bar, so mark where it starts and stops as well. Same for strings & drums.

You should be able to get very close to the original within Biab and its functions. Use F5 to mute/play the Biab parts.

There are a couple of held chords, might wanna change the meter to 2/4 prior to the held chord and then to 4/4 on the held chord, since it is held into the next bar. One of my workarounds in Biab for those type of holds.

Beautiful song !!

You should be able to "build" this one within Biab. Good luck,

Trax