Crystal Reports Wanting to sum Consolidation accounts from Busines

Message

   I am trying to figure out the formula for summing some consolidation accounts from Businessworks Gold 2011 (BWG).  I have the developers edition of CR for BWG so I can access the DB for BWG.  

The account numbers from BWG "Chart of Accounts" are:

400000.000

419999.000

430000.000

The Table for "GLAccount" has the fields of "GLAccountNumber" and 
"Description" that show all the account numbers from the Chart of 
Accounts an a description of what that account number is for.  When I 
drop those fields onto the report, I can see the accounts listed that I 
want to sum.  I don't want to sum the account numbers obviously, rather,
 the dollar amounts that are listed for those account numbers.

These accounts are consolidation accounts inside BWG and as I understand
 it, they total several separate accounts to come to a "grand total" for
 those accounts.

I want to place the sum in the report footer.

How do I create a formula to sum all these values?

TIA;

Chris