multi track recording/editing/saving/pasting

I am using windows 10
I am using Audacity for a podcast. I am narrating over another track with another track while that one is playing. I want to save both tracks. I then want to paste those tracks within my podcast somewhere. I have tried several ways to do it but have not been successful. I have done the multi track save but have not been able to figure out how to save it then past it into the body of the podcast.