Preferred Roaming List (PRL) Tool  
  This tool (PRESTO) is provided by the CDG and will help your organization with the editing of PRL files.
How To Install the Tools and how to run them:
In order to install the tools download and execute the Setup.exe application and follow the screen instructions. After the installation the application is embedded into Microsoft Excel. When you start the Excel application you will be able to see the toolbar and all the available options.
  Download the PRL Toolbar Suite Application

Download the PRL Toolbar Suite Tutorial