CAsh Account Beginning Balance

I have a situation where our company has 4 different Cash Accounts of 2 different backs for 2 branches.  GL account AAAA, we have 2 cash accounts AA and aa also GL account BBBB, we have 2 cash accounts BB and bb both have the same Account Class. When I imported the Trial Balance Cash Accounts AA and aa showed the right amount, but Cash account BB an bb shows the beginning balance as 0. Does anyone know how I can make account BB and bb show the beginning balance?