Extract all *.tie files to the LucasArts\XwingTie\Train directory.
Then cut and paste the following to the bottom of the Imperial and 
Mission lists in the LucasArts\XwingTie\Train directory.

//
[Imperial Order Battle I]
//
50
iob01m1.tie
Mission 1
51
iob01m2.tie
Mission 2
52
iob01m3.tie
Mission 3
53
iob01m4.tie
Mission 4
54
iob01m5.tie
Mission 5
55
iob01m6.tie
Mission 6

Start the game and create a new pilot.  The Imperial Order missions
will be with the Training Exercises.  Note:  It is possible to put
the missions in with the Combat Engagements, but the game will still
recognize the Imperial Order missions as Training Excercises since
they are made in Training format.