Dear aspirant,

As per the information provided by the university, your OBC certificate needs to be centralized and must be issued by the SDM.
For more information regarding this, I request you to visit the link provided below:

https://www.du.ac.in/du/uploads/COVID-19/01072020_FAQs%20related%20to%20admission%20against%20Reserved%20Category.pdf

If you still have doubts, I request you to further clarify your query.

Hope this helps!