Pro Tools lets you coalesce clip gain settings to track-based volume automation, as well as letting you coalesce track-based volume automation to clip gain settings.
When coalescing clip gain settings to volume automation, the clip gain settings are cut from the clip and coalesced with track-based volume automation at the same timeline locations as the clip.
When coalescing track-based volume automation to clip gain, the volume automation is cut from the track volume automation playlist and coalesced with the selected clip gain settings. Once volume automation has been coalesced to clip gain, volume automation is set to 0 dB for the selection.