When you're setting up squads and/or sessions for a sanctioned match, you can open a window that keeps a running total of each.

The Totals button on either the Squad or Sessions tab will open the screen.

 

Note that the totals screen does not update automatically.  ClickRefresh to update the totals.

Note also that this window is on a separate thread, so you can minimize it while you're working on the registration screen.