BADI to make fields available for functional configuration

My functional consultant just told me to implement the following BADI: WSAM_BASIC, WSAM_PURS and WSAM_PLNT, because she want to get the following fields : MARA-BRAND_ID, MARA-MSTAE, MARA-MSTDE, MARA-SAISO, MARA-SAISJ, EINA-LTSNR, MARC-DISPR, MPOP-PROPR, WRPL-TRCOV, WRPL-SOBST, and then get them in configuration (customizing) to put in screen or whatever, I don't know whether it is possibly, if yes, how can i do after implementing these BADI?

Thanks