From a command line type FFXCONFIG and [Enter]. Take Option 7′ to ‘Work with FastFax Extractor Templates’, take Option #2 (Change) on the template. Tab to “Optional” and take option ‘1’ to work with Transmission modifiers and select ‘Description/Reference’. Choose to define the Desc/Ref in the spooled file, then follow the prompts to select the beginning and end positions of the Invoice Number. Press [Enter]. Press F3 to exit. Then hit [Enter] to save the change.