Deal Slip and Local Reference Fields

1. How do i get a local reference field to display on a deal slip?
2. How do i use a subroutine as the format field in a deal slip?

2. How do i use a subroutine as the format field in a deal slip?

Subroutine can be attached to the field Format , which will accept only one arguement . So based on the data received from the respective field ,the routine must be customized and pass the necessary changes back to deal slip.
Subroutine must be followed by @ symbol just like validation routines.

@ should be followed by the subroutine name,

eg: @SUBROUTINE-NAME