There's little to no CB Auto Actions documentation. It's a tool so there's nothing to document beyond usecase examples. The parameters describe themselves pretty well. The most useful documentation is probably the trigger one as it tells you what variables a trigger has, which you can find below.

www.joomlapolis.com/documentation/279-community-builder/tutorials/18358-using-cb-triggers

We've a few usecase videos below as well.

www.youtube.com/playlist?list=PLp0puRITgC7McQcw0Sli1qfSUQGwmflzi

The example I provided you is on your below topic.

www.joomlapolis.com/forum/153-professional-member-support/237527-cb-activity-recent-activity-order-notifications#297893

You need to have an exact usecase in mind for me to provide you an example, if possible, as It's just a tool. Like a hammer, but I'm not going to explain what all you can build with a hammer unless you were more specific like "How do I build a deck with this hammer?".