...
Ooh Component Groups are really very interesting. Have a look at the bit around Bullets and Numbering in the help document http://help.nintex.com/en-us/docgen/docservices/Default.htm#Services/manageDDP/componentLibraryQuickStart.htm%3FTocPath%3DUse%2520advanced%2520techniques%7C_____2 This is very powerful what you can do with them.
You know I'm not sure I would have ever thought to use Components within Component Groups. I would probably add that text to a custom object. But this is actually quite interesting as the Components themselves can have merge fields. Ooh full of possibilities.
Still not sure about how you use the same components on different packages, but that's yet to find out.
...