How do I add fields to the sidebar menu when creating/editing nodes? I would like to add to the sidebar menu on the create/edit node pages. How would I do this? 

I would like to do this in order to make the content creating/editing a little cleaner and easier to understand for content editors. 

See attached pic...

Thank you.
The latest version of Field Group module supports putting fields into the sidebar (at least for nodes).

Field Group version >= 3.0-rc2, containing issue 2652642