How do you add separate lines of music?

I want to have several lines of 8 measure lines. I am trying to do a page of 1st position guitar scales where each line is a different scale. I have my first line done and it ends with a double bar line. Now I want to add a 2nd line with a different key signature separate from the first. I can't figure out how to do this. I don't want to have one scale per page.

michele