EXFO FastReporter 2 - Manual (Page 176)

Working with OTDR Files
166 FastReporter 2
Managing Bidirectional OTDR Files (FR2-FC Mode)
Working with Virtual Bidirectional Files
Virtual bidirectional files are a way to preview the resulting measurement
when you select two matching unidirectional measurements without going
through the process of fully creating the bidirectional file. The display in the
graph and linear views, and the Event Table tab are the same as they
would if you are viewing an actual bidirectional measurement. The order
of display for the elements depend of the A -> B measurement.
Note: You cannot create bidirectional files with multimode measurements.
To activate the virtual bidirectional file mode:
From the View menu, select OTDR, then Display Virtual OTDR Bidir.