You can select a range of frames in the Score and then copy, delete, or paste all the contents of the selected frames. When you select frames, any sprite within the range is selected, even if it extends beyond the range. You can add new frames to a movie at any time.
To move or delete all the contents of a range of frames:
If you cut or delete the selected frames, Director removes the frames and closes up the empty space.
Note: To delete a single frame, choose Insert > Remove Frame.
To add new frames:
The new frames appear to the right of the selected frame. If there are sprites in the frames you select, they are tweened or extended.