MACROMEDIA STUDIO 8-EXPLORING STUDIO 8 Manual page 101

Items are cut, copied, and pasted using the following criteria:
You can cut or copy one item or multiple items.
You cannot paste a shape from the Stage into the library.
You cannot paste a library item into a common library, because
common libraries cannot be modified. However, you can create a new
common library. For more information, see "Working with common
libraries" in Using Flash.
When you paste a library item onto the Stage, the item is centered.
To paste a library item into a folder in the destination library, you can
click the folder before pasting.
You can paste a library item into a different location in the same library
where it originated.
If you attempt to paste a library item into a location containing another
item by the same name, you can select whether to replace the
existing item.
To cut, copy, and paste library items using keyboard shortcuts:
To copy or paste a selected library item, press Control+X (Windows) or
Command+X (Macintosh) to cut the item, or press Control+C
(Windows) or Command+C (Macintosh) to copy the item.
To paste a cut or copied item, click the Stage or in another library to set
the insertion point, and press Control+V (Windows) or Command+V
(Macintosh) to paste in the center of the Stage, or press
Control+Shift+C (Windows) or Command+Shift+C (Macintosh) to
paste in place (in the same location as the original).
Flash basics 101