How to Join Actions

Is there a possible way to join action together?

I know that I can link them together in a linear fashion via the NLA editor, but is there a way to join the actions into one large action?

Thank you all very much. This user community is truly a great group of people.

You can copy and paste the key frames from one action into another and keep extending it.

Thank you very much. I also found that the bone groups must all be expanded in the action editor, and must all be selected for copy and paste to work.