Standard BAPI BAPI_GOODSMVT_CREATE Header Custom fields add for custom table

Hello Expert!!!Need to add zfields in the header portion as per business requirement. I want to make a copy of "BAPI_GOODSMVT_CREATE" to ''ZBAPI_GOODSMVT_CREATE''. In the header portion 3 custom fields need to add.Function group MB_BUS2017 copy as ZM...