How to right-justify line part with rest of line left- justified?

[Guest]

I'd like to have one part of a line left-justified and another part of the
line right-justified. I try to highlight the right part, go to paragraph, and
right-justify. But the whole line gets justified. Surely there's a way.

 

[Jezebel]

Insert a right-tab at the end of the line. Enter the first part, tab, second
part.