Apple Final Cut Express HD - Manual (Page 354)

354 Part VI Rough Editing
2 In the Timeline, move the playhead to the location in your sequence where you want
the clip to start (the sequence In point).
3 Now, if you do an overwrite edit, you’ll see that the entire clip in the Viewer has been
edited into the sequence. Since you used an overwrite edit, any clip items that were
already in those tracks in the sequence have been overwritten by the source clip.
Move the playhead to the
location where you want
the new clip to begin.
The playhead moves to
the end of the new clip.
The new clip begins
where the playhead
was located.