Sequence into a sequence WITHOUT nesting

Hello, 

I create different Sequence without nesting them, 

then i start to edit just dropping this different sequence (because thery are different scene of the movie) 

and cutting them in the new timeline. 

Now i need to have back the original file, becuse there are different audio channel that i need to use...but 

i don't know how to do it. I know about the NESTING UN-NESTING button but i try it and it not works, 

maybe because the original sequence that i create aren't NESTED? 

THANK YOU for any help, becuse if i made a big mistake i'll have to replace evrything by hand. 

best

Federica