If you have a download with a concatenated GL string (such as 10.00100.100.000000.6800.999.9999.9999.999.999) and you want to separate it into the component parts here are some easy instructions.

In Excel, create ten blank columns to the right of the column holding the GL Code Combination.  Highlight the column holding the GL Code Combination.  Select the Data menu at the top of your Excel window, then select Text to Columns.  You will get a pop-up dialog box.  Let the radio button stay on the default choice of Delimited, click Next.  Choose the option Other and type a period in the box, click Next.  Highlight all columns and click the radio button for Text in the upper section, click Finish.