I'm animating a hand animation, but the dope sheet has ended up with around 10 different actions and I have no idea how to merge them:
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If you want to merge (append) the actions into a single action you could select the keyframes in the action editor to copy and paste Ctrl-C / CtrlV them. Both are also accesible from the Key-Menu:
In case you want to cross-fade them you would need to use the NLA-Editor and arrange the actions on its timeline.