Copy Prior Year Retained Earnings

Anyone willing to share the process by which you copy prior year accumulated retained earnings to the current year? Is this just handled via data management steps, or do you need a business rule?

It does not seem that our implementation partner set this up for us... therefore this account currently is just being imported from our ERPs at the start of the year. This is an issue for our few entities with foreign currency, as the balance continues to translate at the current month closing rate, which we do not want. 

Appreciate any insight! :-)