What is purchasing info

Welcome here in Community, @ketak_gupta_iamt,

Purchasing Information shows details about the products or services that you've entered into your QuickBooks Online (QBO) account.
 

If you want to learn how to set up products and service items, you can read through this link: Add product and service items to QuickBooks Online.

In case you need clarification about adding your items, you can leave a comment below. I'll be here to lend a hand. Keep safe.