To solve this challenge, I am using the plugin called “More Fields” to achieve what I want.
This is actually a built-in feature of Simple Fields.
When you click on Post Connector, under Field Groups, you can add as many field groups as you want.
Excellent!
I had exactly the same problem as the original poster.
For the sake of helping others that may encounter the same problem:
If you are using the standard twentyten template, add the custom code to the end of functions.php which is found at
/wp-content/themes/twentyten/functions.php
