According to the HDFC Bank, following these simple steps to open NOS in HDFC Bnk.
Step 1: Visit www.hdfcbank.com

Step 2: Under ‘Personal’ click on ‘Invest’

Step 3: Select the last option is ‘ National Pension System’

Step 4: Click on ‘Apply Online’

Step 5: Select the CRA of your Choice (either NSDL or K-Fintech) and click on ‘Apply now’

Step 6: Select individual or Corporate subscriber

Step 7: Select weather you wish to open Tier I or Tier I and Tier II both.

Step 8: Mention PAN number and generate acknowledgement number

Step 9 Complete the rest of the details in the NPS form.

Step 10: Upload the required documents.

Step 11: Make initial payment.

Step 12: PRAN will be generated with in 15 to 20 minutes

Step 13: Complete the e-sign/OTP authentication process online.