How do you repeat the total of each sub-summary line at the end of the report?

Hi,

I wonder if there is an easy way to repeat the calculated totals of sub-summary lines, say, at the end of the report.

I have an invoice like this:

A-Items

Item A.123 $1

item A.124 $2

Item A.125 $1

Total Items A $4

B-Items

Item B.012 $2

Total Items B $2

C-Items

Item C.111 $5

Item C.112 $5

Total Items C $10

Grand Total $16

But, before the grand total, I would like to include a couple of extra lines. I would like to repeat all the sub-summary lines of the report once more, like this

Total Items A $4

Grand Total $16

Is this possible without reinventing the wheel?

Thanks a lot for any help!

Gary