clone-bars from-section &rest begin end to-section
This one enables to make direct copies of a section subranges. The begin end range (bars) of the from-section are cloned to a new section, which has only these two bars. All classes are cloned at once.
This function is useful if you are working with a section which produces nice material lets say within bars 7 to 9, and you don't want to have the trouble to figure out what is exactly happening there. Instead you'll just clone these bars into a new section, which you can then play multiple times (loops).