Here is the Import template.  The existing data is there for samples.  Delete all of the lines, then only add lines for GL Codes with balances.  We will date this on the apply date before the go-live date, so it will give the beginning of the month balances.

Once this is done, save it as a CSV.  I then open the CSV file in notepad, delete the top line with the headers, then make sure there are not blank lines at the bottom (just commas)  Then we can import it in.  I normally help with the process once we are ready.