Pull Column Sums from various dashbaord tabs onto a "Summary"Tab

I have just created this nice dashboard with a number of tabs. I would like to have a single tab that grabs some of the summed totals for a few choice columns and plunk these on a tab that I will call “Summary”. What is the easiest way to do this? I thought there was one, but I can’t find it.

-What I am developing is turning into an Executive DB with all these dimensions in a cube, but I wanted to see if there was a quick and dirty way of writing these totals to a different tab before I spend another few days into creating an Exec DB.