In Elements 7, how do I split a stereo audio track into two mono tracks?
Export audio mixdown/split tracks. Import to pool & project.
Thanks, I’ll do that. Why isn’t it as easy as in Audacity?
Different manufactures. It’s as easy as that. 
Not as nice as in PT or Logic… I hope that they implement a better way to split stereo to mono and vice versa on C8…
A Nuendo feature only, so far.
It’s not good enough to accept that this feature is poorly implemented. Audacity is free and Open Source and has had this for many years. Cubase isn’t and hasn’t. It’s hardly an obscure feature. In Audacity it takes two clicks.