Can I add an additional row to a Straigh Table to display a subtotal value?

Hi all,

Here is my scenario:

I need to display a straight table with a Total for Sales and Service, and then display one more line in the table to display a subtotal for just the Service portion. Please see the screenprint below (and the attached qvw) for a prototype of what I am trying to display:

Do you have any thoughts on how this can be done, or do you know if there is a QV extension that would provide this capability?

Thank you in advance for your thoughts.

Regards,

Jim