Pro Tools lets you convert clip gain settings to track-based volume automation, as well as letting you convert track-based volume automation to clip gain settings.
When converting clip gain settings to volume automation, the clip gain settings are cut from the clip and pasted to track-based volume automation at the same timeline locations as the clip.
When converting track-based volume automation to clip gain, the volume automation is cut from the track volume automation playlist and pasted to the clip. Once volume automation has been converted to clip gain, the clip gain settings stay with the clip when moved, cut, copied, or pasted.