How to deal with sends when merging projects

[feelthetrip]

I am putting together a new live performance playing my ableton songs. The way I want to do it is merging several songs onto one big ableton project.
Each song is a group of tracks separated on scences. So all I need to do is open up the performance project and drag & drop the songs to it. This is very useful but return tracks aren't copied when I do that. So, even if I create all the needed return tracks on the performance project, it would put the send value on the wrong pot... because (for instance) A pot on the original project send to a different return track that on the performance project :/

So, has somebody any idea about how to deal with this?

Thank you!