Apple Final Cut Pro 6 - Manual (Page 1068)

Chapter 14 Changing Motion Parameters 283
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3 In the Canvas or Timeline, position the playhead over the clip you just edited into track
V1, then set the sequence In and Out points to be the duration of the building clip
(choose Mark > Mark Clip, or press X).
4 Perform a superimpose edit to place the sign in track V2 for the duration of the shot.
Instead of changing settings in the Motion tab, you’ll manipulate the images in
the Canvas.
Position the playhead
anywhere within the clip.
Set the In and Out points
for the duration of this clip.
The sign is now on top
of the building.