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There is a similar method in Edit Mode: Vertex Group. I need something similar but with animation keys in the Graph Editor.

animation of adding vertices to a vertex group

Description of video: A demonstration of selecting vertices in a mesh and then adding them to a vertex group. This is followed by selecting keyframes in an F-Curve and a question mark — meant to indicate the desire for the equivalent functionality, a sort of "vertex group" for keyframes.

Advantage / application animation key grouping:

  1. Analog - NLA but in one action. Replacement / alternative to NLA. Place the grouped cycles of different gaits in one action further along the timing, in order to substitute one or another grouped part of the desired cycle in the right place of timing in the process.
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The keyframes in an F-curve are equivalent to the handles of a curve object and there is no available method for collecting a subset of the handles to create the equivalent of a vertex group.

But you hit on the way Blender solves what appears to be your underlying request. This is precisely what the Action Editor is meant to provide. Actions are the equivalent of the subsets, but instead of simply having collections, you create the F-curve in a two step process, by combining actions in the NLA.

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  • $\begingroup$ Thanks for the reply! I wanted to do it without NLA. Because the animation created using NLA is difficult to transfer to another file via Append. But F-curve through Append Action is easy to transfer to a new file. $\endgroup$
    – Fix379
    Jan 9, 2022 at 0:30
  • $\begingroup$ I thought that was the case. Unfortunately, there is no F-curve equivalent to vertex groups. But don't give up hope. There is currently a lot of work being done by developers on animation tools. Perhaps you could go to RightClickSelect and submit a suggestion. $\endgroup$ Jan 9, 2022 at 0:52
  • $\begingroup$ Ok. Thank you! :) $\endgroup$
    – Fix379
    Jan 9, 2022 at 13:06

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