> Trimming a Clip
> Reducing the Clip Length—To trim the front of the selected clip, position the scrubber at the time you want the clip to begin, then press the W key or select Edit > Trim Front to Scrubber. This trims the clip up to the scrubber, thus changing the start time—but it does not alter the referenced media.
> To trim the end of the clip, position the scrubber at the time where you want the clip to end, then press the E key or select Edit > Trim End to Scrubber. This trims the clip (not the media) after the scrubber.
> You can also grab either end of the clip and drag it inward to trim it.
> Lengthening a Previously Trimmed Clip—On a previously-trimmed clip, you can pull either edge out from the clip to restore trimmed media.
> Note: Trimming changes the amount of time the clip plays; it does not modify the referenced media file.