I am trying to change the category on a batch of products, but the category doesn't save after selecting the products and category from the drop-down.

Hi SydJasonB,

Thanks for posting in the Community! Let's perform some browser troubleshooting for you to be able to save the category on a product. Let's start by accessing your QuickBooks Online account in a private browser. Unusual behavior and error messages can happen when our browser stores too many files and cache. If you haven't tried it yet, please follow these shortcut keys.

• Google Chrome: Ctrl + Shift + N 
• Mozilla Firefox and Microsoft Edge: Ctrl + Shift + P 
• Safari: Command + Shift + N 

If the same thing happens, we can go back to your regular browser and clear the cache. Alternatively, we can also use other supported browsers.

If there's a need to change the Income account and Expense account of your products and services, you can follow these steps.

1. Go to Gear icon and select Products and Services.
2. Select Edit.
3. Select an Income account or Expense account.
4. Select Save and close.

For more detailed information, you can check on this article: Change the account for a product/service item.

Feel free to drop a comment below if you have any other questions. Have a great day!