Using Keyword Suggestions, you can find and add additional keyword ideas for each of your URLs and easily add them to be tracked on PRT.
Enter from left menu: Tools > Keyword Suggestions
Select a URL to get suggestions for at the top, and you'll see the suggested keywords list.
To add keywords, click one of the 3 orange Add buttons at the bottom right (Desktop, Mobile or Local Finder), and you'll be redirected to the Advanced Add, set the wanted tracking settings and save (Add).
Read here more about the Advanced Add.