Editing : Editing Clips and Selections : Trimming Clips : Trimming with Nudge

Trimming with Nudge
You can trim the start and end points of clips (or MIDI notes) by the current Nudge value.
To trim a clip’s start or end point by the Nudge value:
1 Configure the Nudge value (see Defining the Nudge Value).
2 With the Time Grabber tool, select the clip you want to trim.
3 Do one of the following:
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While pressing Alt (Windows) or Option (Mac), press Plus (+) or Minus (–) on the numeric keypad to trim the clip’s start point by the Nudge value.
– or – 
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While pressing Control (Windows) or Command (Mac), press Plus (+) or Minus (–) on the numeric keypad to trim the clip’s end point by the Nudge value.