Apple Final Cut Express 4 - Manual (Page 575)

Chapter 38 Sequence-to-Sequence Editing 575
VII
5 In the Timeline for the second sequence, do one of the following:
 Position the playhead where you want to place the beginning of the copied clip or clips.
 In the Current Timecode field, enter the timecode number where you want to place
the beginning of the copied clip or clips.
6 Choose Edit > Paste (or press Command-V).
The copied clips are pasted into the second sequence.
Important: If you copy and paste clips between sequences in different projects, all
pasted clips are independent, because master-affiliate relationships do not span
projects. To create master clips for the independent clips, you can select the sequence
and choose Tools > Create Master Clips.