Hi All, I have a requirement to add a new selection criteria in SAP transaction code J6NY

Hi All, I am working on Opentext Doculink solution for billing documents in SAP.I need help in adding a new selection screen field with F4 help in SAP transaction code J6NY. Please can you help with the steps to do it and also where to do the coding to filter the output with the selection screen input values. Thanks in advance

Smitha.