How to get my daughter's cast certificate?

Check at authority that issues such certificate at your location e.g; Tehsildar, Taluk level officer, SDM,DC…..and opt for online/offline option whichever is available…

Search online and you can get full info e.g; https://edistrict.delhigovt.nic.in/in/en/Public/Faq.html https://www.delhi.gov.in/wps/wcm/connect/doit_revenue/Revenue/Home/Services/Certificates/ https://www.delhi.gov.in/wps/wcm/connect/doit_revenue/Revenue/Home/Services/Certificates/OBC+Certificate https://edistrict.delhigovt.nic.in/ https://govinfo.me/procedure-apply-caste-certificate-karnataka-%E0%A4%95%E0%A4%B0%E0%A5%8D%E0%A4%A8%E0%A4%BE%E0%A4%9F%E0%A4%95-%E0%A4%AE%E0%A5%87%E0%A4%82-%E0%A4%9C%E0%A4%BE%E0%A4%A4%E0%A4%BF-%E0%A4%AA/

I Am A Hindu Havyaka Brahmin I Dont Have TC Of Mine Can My Wife's TC And Details Use To Get Cast Certificate