As Gordon says, this is not really a Hot Potatoes question - it's a general Moodle one.
What you call "lines" are, I think, what Moodle calls "sections" or "topics". You can put lots of Quizzes or Hot Potatoes in one section. Below there's an example of two sections from one of my courses. You can see the actual course here: http://uepd.quizport.com/course/view.php?id=56
There are more courses on the platform that you can have a look at to get ideas for different ways of presenting quizzes and other documents and activities. When you've got used to Moodle, you'll find it's quite easy.