Want one channel of stereo .wav to become BOTH channels

It’s a live recording where the right channel has a better balance of all instruments. I want to create a 2-channel .wav file in which both channels contain the original recording’s right channel. Any help much appreciated – Thanks

So the result will be “2 channel mono”. Yes you can do that, but won’t “1 channel mono” do?

See here for how to split and join track channels: http://manual.audacityteam.org/o/man/splitting_and_joining_stereo_tracks.html