err, I don't know if you want to know the BPM of the song, or the way osu! store BPM in .osu file.
If you want to know the BPM of the song you can post your map
hereIf you want to know the code----Yes, it is stored in [TimingPoints]
the general form of timing points are x,x,x,x,x,x,x,x
1st x means the offset
2nd x means the BPM but in the other format, the BPM in Edit is equal to 60000/x.
3rd x is related to metronome, 3 means 3/4 beat., 4 means 4/4 beats.
4th x is about hitsounds set: soft/normal...etc
5th x is custom hitsounds: 0 means no custom hitsound, 1 means set 1, 2 means set 2
6th x is volume
7th x means if it's inherit timing point
8th x is kiai time