Mixing : Automation : Editing Automation : Editing Automation on Grouped Tracks

Editing Automation on Grouped Tracks
When you edit automation on an audio track that is a member of an active Edit Group, the same type of automation is also edited on all tracks that are part of that group. This occurs even if the playlist for that type of automation is not currently displayed on the other grouped tracks.
Examples
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If you create new automation breakpoints on a grouped track (with the Pencil tool or any Grabber tool), other members of the group have breakpoints placed relative to that track.
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If you move automation on a grouped track (with any of the Trim tools), other members of the group have their breakpoints trimmed relative to that track. This lets you trim entire sections of a mix.
 
To individually edit a automation for a member of a group without affecting the other members, do one of the following:
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Press the Start key (Windows) or Control (Mac) while you perform the edit.