The specific documents required for registration at the BISP Tehsil Office may vary, but commonly requested documents include your CNIC (Computerized National Identity Card), proof of income, proof of residence, and any other relevant supporting documents specified by the BISP program guidelines. It is recommended to contact the BISP Tehsil Office or refer to the official BISP website www.bisp.gov.pk for a comprehensive list of required documents before visiting for registration.