Getting a sum total of participant values when arranged by groups

[Breakneckbrands]

I am trying to get a sum total of all the hours, demos... Where they can be displayed in an isolated field or additional table. I have tried roll-up and look-up fields into another table with no luck. 

[MLO]

Is the issue that a rollup field (on the Agents/user table) show total by Agent but not overall?

If so, you have a few options off the top of my head:

1. Add a dashboard interface or extension with this total
2.  Add an "All" Agent and link to that; then create a rollup
3. Add a new Reporting table that every record on Imported Data links to and rollup data there