ebanking using Natwest bankline templates

SUGGESTED

I have just starting using Ebanking option for suppliers.  I post the payment to the supplier account (s) and can produce the file to import to bankline for standard domestic payments ok.  In bankline we normally use templates for all the supplier bank accounts.  There is an option when creating the file from sage to use templates.  Anyone know how to do this please ?   I can't work out where you put the template reference in the supplier details ?