I have tried for years to understand how to summarize a field in CR.

Here is my report

The last column was from the original report show total between group and final total.

The field to the left of that is a formula based on the total cost per group.  Call that field Junk...

How do I summarized the total for Junk.

I see the field available to the right in the list of Field Explorer,

 but when I go to insert a Summary it's not available.

So I'm at a loss...

Looking for idea's...   What did I miss or forget....

Thanks....