Hello, Vishal Ragam
Welcome to the Microsoft Community.
Hello, thank you for your feedback on your issue here, it seems that you want to reinstall win11 system.
You can directly refer to the installation steps mentioned in the thread below, which is also about the activation issue, for the case you mentioned that it does not show the consulting activation key, it may be that the OEM reads the key automatically, you can go into the system after the installation to check whether it is activated or not.
How to: Perform a Custom Installation of Windows 11 and Windows 10 or - Microsoft Community
Best regards
Bobhe | Microsoft Community Support Specialist