How to add new fields to Benefits Seeded extract

Summary

I need to add new fields to Seeded benefit extract. On manage Plan carrier screen, there is a Formula type . I have created new formula type but I dont see this fields on the extract.

Content

Created new formula type: Benefits Extract Custom Data Rule

Formula content is:

 

/*************************************************************************************************
FORMULA NAME: Ap_ER_Formula
FORMULA TYPE: Benefits Extract Custom data Rule.
DESCRIPTION: The formula returns Assignment number and Last Name of the person.
*/

DEFAULT FOR PER_ASG_ASSIGNMENT_NUMBER is ' '
DEFAULT FOR PER_ASG_JOB_NAME is ' '
DEFAULT FOR PER_ASG_LAST_NAME is ' '