title: Blender: Merge multiple actions
body: <p>I have a model with several actions for different objects, see: <a href="https://i.stack.imgur.com/RSc4P.png" rel="nofollow noreferrer">NLA editor</a> 
  My goal is now to create one single action for all these actions, similarly to: <a href="https://blender.stackexchange.com/questions/80550/is-it-possible-to-use-one-action-for-multiple-objects">other multi action solution</a>, but without using bones.
  How can I achieve that? 
  Thank you very much for your help!</p>