In the Lightning experience, how do I add a tab on built-in Salesforce objects?

Hi Tanu,

I don't think it's possible right now with Generally Available functionality. Your only option might be Lightning Extensions, currently a pilot feature. Or, for a much higher level of effort, you could build a Visualforce page for an action override.

Or if you want to create a tab for custom object , it is easily possible in both salesforce classic and lightning.

Hope this helps you.

Thanks