Regarding F4 Search help

Hi Friends,

I want to add seach help in my parameter field, but field already has f4 help but i want to add to new fields in f4 help.

Filed Name is ILOA-TPLNR.

F4 help show only these fields TPLNR, Text and Language but i want to add plant(werks) and equipment number(EQUNR) information in f4 help.

Please explain me step by step.

Reagrds

Amit