Visit the Nearby Income Tax Department website and go to the 'Surrender Duplicate PAN' option. Enter the details of the duplicate PAN number and the PAN you wish to retain as well as your details such as full name, date of birth (date of incorporation in case of companies), and contact details.
Surrender PAN Card
If you wish to cancel/ surrender your PAN (which you are currently using), then you need to visit your nearby Income Tax Assessing Officer with a request letter to cancel/ surrender your PAN.