Unalbe to know the process to populate Secondary Ledger

Hi, All

Companies need : Create a Secondary ledger (in the month of OCT 2011) and copy over all the Journals from primary Ledger till date.

Seconday ledger set-up is same as the Primary ledger. (same c's for both)

i.e Secondary ledger is suppose to be the exzact copy of the primary Ledger........ ?

My question is How can I achieve this ?

What is the process to follow?

What is the best way to complete this task ?

All GL guru's are welcome to answer and discuss this issue.

Thanks in Adv