Mixing : Automation : Writing Automation to the Start, End, or All of a Track or Selection : Write to Start, End or All and Trim Mode

Write to Start, End or All and Trim Mode
While in Trim mode, it is also possible to write trim delta values for track volume and send levels to the start, end or all of a track or Edit selection.
To write current trim delta values to the start, end, or all of a track or selection:
1 Choose Window > Automation.
2 Make sure the automation type (track volume or send level) is write-enabled.
3 In the Mix or Edit window, click the Automation Mode selector of the track you want to trim automation, and select Trim. The track Volume and Send Level faders turn yellow.
4 Do one of the following:
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– or – 
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5 Click Play to begin playback.
6 When you reach a point in the track or selection that contains the trim setting (delta value) you want to apply, click the Write Automation to Start, All, or End button in the Automation window.
7 Stop playback.
The relative changes to the track volume and send levels at that point are written to the corresponding area of the track/selection.