I can't offer any specifics of something to try.  Looking at page 378 of the User Guide indicates that there are two (2) things that have to be set.  Pretty much quoting here:

"Set the Break Element to the LE that controls the subtotals (such as Company) and set the Break Value to control the actual break. "

Be sure to go further in the User Guide, and read the "tooltip" that is displayed in Figure 37. (Which opens over the Break Value).  From what I see, you need a Break Value of 0 (zero) because you want the break to occur whenever your field (i.e. layout element) which is called Location changes values.

If your Group Body contains the following elements...
Value Box
Bound To- State
Name- LE0

Value Box
Bound To- SaleAmount
Name- LE1

...then Set the Break Element to LE0 and put an element in the Group Footer...
Summary Calculation
Type- Sum
Bound To- LE1

Try the following.  I used the Customers database that came in the Samples with Sesame.  I first made a copy of Customers by:  Opening Customers in Designer, giving a new name to a DSR file, and then saving as a New Application under a different name (NewCust).

Open NewCust in Designer.  Click on Reports, Customers, Add New Customers Report.  The Report Layout opens.

Click in the Group Body column to highlight this column.  Click in Bind Element To and select STATE.  Click in name and enter LE0  (zero).  Click on Add Element to Report.  The Value box should appear under Group Body.  It should contain:  
Value
[LE0]
State

Click on Bind Element To and select NUMERICAL.  (Note that the Group Body is still highlighted  - in yellow on my screen)  Click in Name and change to LE1.  Click on Add Element to Report and a second Value box should appear under Group Body.  It should contain:
Value
[LE1]
Numerical

Carefully click precisely on the highlighted words Group Body, and a window titled Report Section Properties should appear.  Click on the down arrow drop-down next to Break Element and select LE0 (zero) and then click OK.

Click in the Group Footer column to highlight it.  Click on Select Element Type and move down the list to Summary Calculation.  When the mouse pointer is over Summary Calculation, a secondary window opens and you should select SUM from this secondary window.  The word "Sum" will now be in the Select Element Type area.  Click on Bind Element To and select the only entry that should be there - which is LE1.  Click Add Element to Report and a box should appear under Group Footer.  It should contain:
Sum
[LE2]
LE1

Click Save Layout Design (click second time to see the 'flash' that indicates the layout is saved.)  Click Close Design Tab.

You can now either Preview, Reconcile, or Save as another New Application.  Regardless of whichever you do, here's how to see that this worked.

I'm going to Preview.  Open the file in Search/Update.  Sort the records on State by Clicking in the Spec Window on State when "Sort Main Form" is showing.  This moves State to the top of the list with an "A" entered in the box.  You can now click on the heading Sort Main Form and click Run or press F10 to both Search and Sort the entire database.

Now click on Customers under REPORT at the bottom of the menu tree, and you should have two lines for New Report (Preview or Print Immediately)  Pick PREVIEW, or you will start a long printing process of 377 records!  When you pick Preview your HTML report should appear in your Internet Browser.  It ain't pretty, but it is sorted by state, with subtotals after each break on the State abbreviation.

-----Here's how a few lines looked----
 
AR 43.50
AR 58.88
AR 50.71
153.10 
 
AZ 90
AZ 63.71
AZ 81.36
AZ 74.44
AZ 51.87
AZ 79.07
AZ 88.93
AZ 75.56
AZ 101.23
AZ 76.82
782.99
 
---- and so on.  Looks like some rounding is going on - look at the sum value for the 3 values for AR. ----

I hope following these steps, and seeing this subtotal report, will help you understand how to get subtotals to work.  Your appl. sounds more complex, with several subtotals needed.  Sure hope this helped.