Detailed Subtotals & Totals

I am creating a Sales History Report. It displays products sold by customer by Sales Rep. The groupings are Sales Rep, Customer, and Product. I am hiding the detail section which contains invoice line item records. So the report shows the product subtotal by Company. The problem I have is I need to see the product subtotals in the Sales Rep and Report Total sections also. So the report would look something like this:

Sales Rep A

Customer A
Product A
Product B
Product C

Customer B
Product A
Product B
Product C

Sales Rep A Total
Product A
Product B
Product C

Sales Rep B
Customer R
Product A
Product B
Product C

Customer S
Product A
Product B
Product C

Sales Rep B Total
Product A
Product B
Product C

Report Total
Product A
Product B
Product C

Is there a way to accomplish this without doing sub-reports?