Dear Chris,
Thank you for your query.
Two options:
- Extensible storage -- not user visible
- Shared parameters -- user visible, just as you request in your screen snapshot
If you don't care, the former is recommended.
Check out The Building Coder explanations on Extensible Storage:
http://thebuildingcoder.typepad.com/blog/about-the-author.html#5.23
Some of those discussions also mention the use of shared parameters.
I hope this helps.
Best regards,
Jeremy
