To add bullets after the middle segment, put text cursor at the utterance with the last bullet in transcript and press F5.
To add bullets at the beginning of transcript, put cursor before the utterance with the first bullet and press F5.
This assumes that there is no time gaps in the transcript and that the beginning of transcript starts at the beginning of media file.
Otherwise you can fake it. Copy any bullet to an utterance you want to start linking and press ESC-a or select menu "Mode->Expand bullets", then change the bullets numbers to whatever time values you want, put text cursor at that modified bullet and press F5. The playback will start at that time in the media file.
Leonid.