im no guru so there might be a better way but i would...
open up the first song ( the "from" track), turn the audio engine off,( this will stop any loading when you go to the "to" track
open up the second song( the "to" track) ( yes you can have more than one session open at a time)
create requisite number of empty tracks in the song to be copied to.
save channel strip for track from song copied from,,
select all regions in song remembering where the first region starts ( it may be easier to cut the region to a whole bar number)
drag to "to" song to empty track, then paste channel strip into new track....
go back to "from" track open automation hold down option on the first automation node at 1.1.1.1 ( that will select all automation after) , copy, then go to "to " track open automation and paste..
hope that makes sense.. there is probably ??? a less labourious way.. perhaps using the audio configuration , but ill leave a guru to explain that
and yes its a pain cf pro tools..
i wonder how the other DAWs handle it?
L