Apple Final Cut Express 4 - Manual (Page 414)

414 Part VI Rough Editing
To copy (or cut) and paste clip items within the same Timeline tracks:
1 Select one or more clip items in the Timeline.
2 Do one of the following, depending on what you want:
 Copy the clip items by pressing Command-C.
 Cut the clip items by pressing Command-X.
3 Position the playhead where you want the paste to occur.
4 Paste the clip items at the playhead location by pressing Command-V.
To copy (or cut) and paste clip items from one Timeline track to another:
1 Select one or more clip items in the Timeline.
2 Do one of the following, depending on what you want:
 Copy the clip items by pressing Command-C.
 Cut the clip items by pressing Command-X.
Copied clip items Pasted clip items