How to add GSTIN number in supplier?

I'm here to help you add GSTIN to your supplier's profile in QuickBooks Online (QBO), @ismaeel22. Let's work together to finish it right away.

To start, you simply need to go to the Supplier Information page. Here's how:

1. In your QBO account, navigate to the Expenses menu.
2. Then, select the Suppliers option.
3. From there, look for the supplier’s name for whom you want to enter GSTIN.
4. Next, click the Edit option.
5. In the Supplier’s Information page, go to the GSTIN section.
6. Enter your supplier’s GSTIN and select Save. 

For more info about the process, check out this article: How to add GSTIN for suppliers. 

Please let me know how the steps go. I want to ensure you'll be able to the GSTIN of your supplier in QuickBooks. Have a good day ahead and take care.