Deleting and merging tracks

I use Audacity for creating soundfiles for audio journalism. (Remember radio?) Here’s my simple conundrum: I have a voice track. I want to delete a portion of the interview and merge the remaining two tracks into one. I want to remove the vertical black line! I used to be able to go to Tracks, mix and render. But in Audacity 4, there is no mix and render command–all you can do is add whole new tracks. Anybody have an answer? There’s gotta be a solution!

many thanks from John in Texas

It is not in 4.0 and may get added in the fututre. I have added it to Soundscaper, my audacity 4 port to the web, in the meantime.

Meanwhile, stick with 3.7.9 for critical work.