I wrote a job to import the ledger alias in 2012. It is fairly straight forward if you have the DMF installed.
Create a csv file with the following:
End result will be:
This requires that you have the DMF installed on your environment.
If you are running R2. Make sure to have this fix as I am using the DMF dimension helper class.
Keep an eye on the next post. I will do the same with Data Import/Export Framework.