SteveZ You can achieve a similar effect with the sliders added in 4.3-beta.
Sliders allow you to reuse animations you've created in other animations. So first create the stocking animation manually, then create a slider to use it, and in another animation animate the slider or map it to a bone. This way, at runtime, you can move the stocking by moving a specific bone via scripts. However, 4.3-beta is still an early beta release, so most runtime components have not yet fully implemented the new features of 4.3-beta. It may take some time before you can test the runtime effects, but you can currently use sliders in the editor with the latest 4.3-beta, so please give it a try.

SteveZ Unfortunately, this feature is brand new, so we have not yet prepared a tutorial.
Although Chinese translations have not yet been added, tooltips are already available when you hover your mouse over each property, so please refer to them for the meaning of each property. If you have any questions after trying it out, please feel free to contact us.