see keyframes for subpart

I am using timeline for animation.
If I want to delete all the keyframe for the figure's leg for example, I can select the leg, and it only shows me the keyframes for the leg, and I can delete these to keep the leg constant.
However what if I want to delete all the keyframes for a subpart, like the mouth that is part of the head, or even just the mouth's smile. I can select the head, and then I see all the keyframes for everything to do with head, but is there a way to see the keyframes for just one property of the head/mouth or any other object. i.e. filter and delete the keyframes for just one property of an object, not the entire object.
(this would then let me for example change the mouth to a smile, and not have to update 100 keyframes in the animation that had set the mouth because they set the head)
Comments
With graphmate open, just hoover the mouse over mouth smile in parameter pane and a graphical representation of the keyframes will show. You can then edit strength, bias, etc. move copy or delete any of the keyframes for mouth smile. Keymate can also do a lot of things but won't show the graph.
On the default DazStudio timeline the keyframes are linked to a node - this could be a bone segment.
If you want to reset just one Property like some expression on the mouth there is a trick I often use.
First I change the value of the Property to my liking. Next I use the Memorize Pose action with a keyboard shortcut but it can be found in the Parameters pane Options menu.
Now as you can see the value of the Property changed from bright to dark color that means with the Memorize action its in default state now.
Then hold down the Alt key and left-click on the Property this will reset the value of the Property to the default value on all keyframes at once.
Memorize, Restore, Zero and Clear are esential to everything related to keyframes.
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