Thank you for reaching out to us, ahenning1911. I'm glad to inform you that you can import multiple items in QuickBooks Desktop.
There are several file formats you can use to import your data, such as MS Excel, CSV, or IIF files, and the data you enter may vary depending on whichever you use.
You can also check this article for more information about importing data: Import and export data in QuickBooks Desktop.
While it is possible to mass-upload your file, there's a maximum number of entries you can have for the item list in QuickBooks Desktop Enterprise.
Alternatively, you can also use a third-party app to import your data.
If you need guidance on modifying your item, I am adding these articles that can help: Add, edit, and delete items in QuickBooks Desktop.
Please let me know if you have further questions or concerns about importing your data into QuickBooks Desktop. I'm always here to help. Stay safe.