Cast or domicile se relative question

Sir me bihar se belong krta hu.pr mere pita ji ham sab ko lekr haryana aagye the.meri schooling or greduation haryana se hui hai.mere sare document haryana k h sivaye meri date of birth k,Vo bihar ki h.sir meri cast yha bc.B me aati jabki bihar me hum S.T cast se belong krte.pr ab meri cast or residence haryana se ban gya h.haryana me hamari cast ko bhadbhunja bolte h jabki bihar me gond bolte.kya me bihar se cast certificate or domicile bnva sakta hu.center ki job k liye aplly krna h.help me.