inventory

I’ll help you set up your inventory in QuickBooks Online, @jmb1406. 

There are times that too much historical data from the browser causes discrepancies that affect the view and performance of your QuickBooks. Thus, it might be the reason for this unexpected behavior when setting up the inventory.

To get around this issue, I suggest logging in to your QBO using a private window. It doesn't use the existing cache files to help us determine if this is a browser-related issue.

Feel free to use either of these keyboard shortcuts:
 

• Google Chrome: Ctrl + Shift + N
• Safari 11 or newer: ⌘ + Shift + N
• Mozilla Firefox: Ctrl + Shift + P
• Microsoft Edge: Ctrl + Shift + P

 
Once you’re signed in, try clicking the Add item button again. If it works, you can go back to your original browser and clear its cache to start fresh. You can also use another supported and up-to-date browser to narrow down the results.

Moreover, here’s a guide you can use to start adding your inventory products: Add inventory products in QuickBooks Online.

Additionally, I’ve included these handy resources here that can help you track your inventory in the future: 

• Set up and track your inventory in QuickBooks Online
• Manually track inventory

Please feel free to get back to me here if you have further questions about setting up your products and services in QBO. I'd be more than happy to answer it for you. Have a nice day.