Add BTRTL to Authorization Object P_ORGIN

Hello,

I would like to add field BTRTL (subarea) to P_ORGIN authorization object. It's first way. Could anybody please let me know the steps to do this? I learned that I can get a similar effect by creating organizational key (VDSKA1), i.e personnel area + personnel subarea. Could you please help in this? It's second way, but I would avoid third method related with implementation BAdi HRPAD00AUTH_CHECK (method check_authorization).

Best regards

M.