EXFO FastReporter 2 - Manual (Page 77)

Working with Projects (FR2-FC Mode)
Post Processing Software 67
Working in Loopback Mode
8. Select whether the loop will be automatically detected, or if you want
to do so manually. If you select the automated mode, enter a length
value for the loop.
9. If you are in Manual mode, set the loopback start and end elements:

Click on the element that you want to use as the start element,
then click Set Loop Start. The selected elements will bear LS to
indicate their statuses.

Click on the element that you want to use as the end element, then
click Set Loop End. The selected elements will bear LE to indicate
their statuses.

If you want to use a section to set the loop start and end values,
select it, then click Set Loop Section. The loop start and end will
be placed on the event before and after the section.