Editing : Making Selections : Selecting Track Material : Nudging Selection Start/End Points

Nudging Selection Start/End Points
Start and end points for selections can be moved by nudging them.
To move a selection start or end point by the Nudge value:
1 Configure the Nudge value. For details, see Defining the Nudge Value.
2 Make the initial selection with the Selector tool.
3 Do one of the following:
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While pressing Alt+Shift (Windows) or Option+Shift (Mac), press Plus (+) or Minus (–) on the numeric keypad to move the selection’s start point by the Nudge value.
– or – 
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While pressing Control+Shift (Windows) or Command+Shift (Mac), press Plus (+) or Minus (–) on the numeric keypad to move the selection’s end point by the Nudge value.