Can you post a bit more detail?
For example, are the 'segments' you refer to part of a large video clip? Is the video clip already on the time line?
Are the segments individual video clips?
The good news is that it is quite straight forward to get rid of unwanted content. We just need a little more info on how far you have got at the minute.
COMPAQ something or other with 500Gb Boot Disk, 1Tb external Firewire Disk, 4Gb Memory and a super duper sound card, 19" TFT Monitor etc etc etc
Sony TRV33e : Sony TRV310e : Canon XM2
Sony Vegas Studio editions to v11
Remember, there is always more to learn than there is to teach.