After choosing a section from the View pop-up menu, you can use the Duplicate Section command to make an exact copy of the section. The copy appears at the bottom of the section list with the word copy appended to the original name. The copy is completely separate; it is not “linked” or otherwise related to the original in any way, so you can freely modify it without affecting the original section. Duplicating is useful when you want to use an existing section as a basis for new material.
It is not necessary to duplicate sections before adding multiple copies of a section to a song in the arrangement grid. Just drag in as many copies of a section as you want. Unlike the sections made from the Duplicate command, copies dragged into the arrangement grid are references to the original; this means that if you change the original, all instances of it in the song will change, too. If you want to make one instance of a section different from the others, make a copy of it using the duplicate section command.