hello arvibd krishna,
As far as I understand that you want to take admission in BBA llb integrated course but you have only applied for BBA.
You can submit the application form for BBA llb integrated course. Once you complete the registration, they will move you on to further process.
Please register yourself on the Ipu official website for the same.
I hope this helps you out. If there is anything that I can help you with then please let me know.
Till then stay home and stay safe.