I am on Apps9 UPD17 and trying to create an external file output to use similar to ACH, but I need to add one additional field from the supplier record to the output.  There is little to no documentation to do this.  I have tried setting up a new payment method and payment format from the AchFormat and can get it to create the file, but it is the same file as would be the ACH.  I am trying to find out how to change the output, would this be from the FILE TEMPLATE and OUTGOING FILE TEMPLATE on the payment format?  And if so, there is no documentation on how to set this up to include all the needed info.  

Anyone have experience with this or know where I can get documentation or example file templates etc?

Thanks!