Hi Siddharth,

Welcome to QuickBooks Community!

In order to import data into QuickBooks, you can follow these steps:

1. Click the Gear icon and click Import Data under Tools. 
2. You will see the options of different lists you can choose to import.
3. Choose the desired list to be imported and follow the instructions.
4. You can also download a sample file and upload your data in the same format.

I hope this helps!