Right click on the track name in AC, and choose Properties. You can set the start and end times

Thanks for the tip Geoff, I just tried it out and it works too. Too bad that AC keeps this feature so well hidden. I recommend that you aslo playing around with MP3Trim (Toni F's suggestion; see our posts earlier). It automatically removes all starting/trailing silence, so you should be able to glue files together seamlessly.

Henno