In your situation, you have two options regarding your caste certificate:

1. Obtaining an OBC Certificate from UP: If you want to obtain an OBC certificate based on your father's hometown in Uttar Pradesh, you can apply for it there, either by visiting the relevant office or online. You will need to provide your father's documents for this.

2. Obtaining an SC Certificate from Delhi: Since you have been living in Delhi for several years and your caste falls under the SC category there, you can apply for an SC certificate through the Delhi government. You will need to use your Delhi documents for this process.

Important Points:

- You cannot hold two different caste certificates simultaneously from two different states.

- If you qualify as SC in Delhi, you can obtain an SC certificate there.

- If you are recognized as OBC in UP, you can obtain that certificate from UP.

For more specific information, it is advisable to check the official website of the Delhi government or contact the relevant state government office for guidance on the application process.