Hey there, @zehra.noor.
Thanks for getting back to this thread. I'll be adding more details with regards to importing data into QuickBooks.
Before we proceed, can you share with me the type of item list you're trying to import in QuickBooks Online (QBO)? This can affect the amount of data that you'll be entering in your Excel file.
As mentioned above, you can only import 1,000 rows at a time with your products and services from your Excel or Google Sheets. Having said, you can split multiple files into a smaller one.
In addition, you can look for a third-party application that can help you in importing large data into QuickBooks. Just go to the Apps menu and search for the app.

For more details, you can also check out how to import a list of your products and services from Excel or Google Sheets to QBO.
The Community always has your back, so please let me know if you have any other questions. I'll be more than happy to help. Keep safe.
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