how to - Multitrack - Each track with own timing and lasting?

Hi everyone,

I'm using Adobe Audition to edit my voice recordings.

I recorded a script for a meditative purpose on one single file.

I now need to cut this file into many small files (1 line per file).

Therefore i'm using the multitrack tool to edit my large file and cut it into many different tracks to export each one separately at the end.

However, my problem now is that each exported file (each tracks) have the same duration. Even if in Audition, one line is lasting 1 sec, and the longest is lasting around 23 secondes. Each exported files will last 23 sec in the end and i'd love to have each file lasting his own duration. For example Track 1 is lasting 2 secondes in Audition, Track 2 is lasting 5 secondes and Track 3 23 secondes, i need to have Track 1 lasting 2 secondes when exported, Track 2 lasting 5 seconds when exported and Track 3 23 seconds when exported.

Is there any option or setting i'm missing? Could you please help me on that matter?

Thanks!

PS: I Tried to be as clear as possible, but it might be hard to follow.