Sony vegas 12 time line question

I have 5 different time lines. each time line is about 20 min each. I did this because if I were to put it all on one. my computer would freeze up when I wanted to load and edit. I have a rough cut of the film done and I wat to put it all on one time line so I can burn a dvd and send it to my friend who's gonna work on the music for it.
The only way I have been able to do this is to copy and paste to another time line. copy paste, copy paste, copy paste. it's pretty annoying and I am wondering if there is a quicker way. any suggestions?
 
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