Calculate % of Total

I created a report that lists the Slip Value and the Billed Slip Value for all my Projects (Matters) for a given time period.  I included the calculated difference.  The report is sorted by Project and automatically includes a Total at the bottom. 

 

I want to add a calculated field that would show for each Project, the percent of the total.  My goal is an annual report that lists all the Projects and the percent that each is of the total for that year.  Long, long ago, far, far away, many upgrades previously, I created a report that shows for each Project the Slip Values and a percent of the total for all Projects  (just what I want) and it shows Billed Slip Values, but no percent of the Total.  In Design, I see the headers and footer sections, but no Body section.  So I can not "see" how that report is actually constructed.  Many of the standard TS reports have such calculated fields, but again, the body sections are not shown in the Design view, so I can see an example of the syntax.

  

So, for example, I would want each project to list a calculated field something like:

 

     [Slip: Billable Slip Value] / [Slip:??Total Billed Slip Value??] * 100

 

What do I use for the field to represent the report total for Billed Slip Value?  Same question for total Slip Value.

 

As a temporary work-around, I ran the report and then used the actual totals in the equations:

 

     [Slip: Billable Slip Value] / 8,975,253.47 * 100

 

(I wish that was what I actually billed last year.  I came up a tad short.)

 

Thanks.

 

Bob S.