Hi Angie,
You can run a standard report called "Registration Summary By Registration Item" and the data would be available in the Second level of the report.
Go to:
Reporting > Reports > "Standard Reports" > Registration Summary By Registration Item > Move Group Item to the right > Run Report > This is the first level.
Now, Click on the name of Group Item being displayed in the report > Run Report again to reach the second level.
Currently, that is not available in the under New Reporting - "Agenda Items - Registration Summary".
I am logging a feedback for this and forwarding it to our product team.
Thanks a lot for bringing this to our attention.
Regards
Ankita Gupta