To delink a bank account number from your Aadhaar card, you can follow these steps:

1. Visit the official website of the UIDAI (Unique Identification Authority of India)
   
2. Click on the “Aadhaar Services” link on the homepage
   
3. Select the “Bank Account Linking” option
   
4. Enter your Aadhaar number and the OTP received on your registered mobile number
   
5. Select the bank account number that you wish to delink from your Aadhaar card
   
6. Confirm the delinking process

Alternatively, you can visit your bank branch and request for delinking of your Aadhaar number with your bank account.

Please note that this process may not be available for all banks and it is best to check with your bank directly to confirm whether they provide the delinking service or not.

Once delinked, you can then link your bank account with another Aadhaar number by visiting your bank branch or through the online services provided by your bank.