QB Issue Resolution:
log out of QBO, clear the browser cache, close and reopen the browser, and log back in to see if it helped.
If you are using the app, try the browser instead
Resolution for Issue 'How can i Assign a Catagory to an Inventory Product' available: Yes (Solved).
Source: Intuit Community forum.
How can i Assign a Catagory to an Inventory Product: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.Support for browser instead
Quickbooks Repair Pro will resolve it efficiently and affordably. Guaranteed resolution of your issue, or you pay nothing!
Error Recovery for browser instead [Canada]
E-Tech is the #1 Quickbooks data migration and Conversion service provider.
Additional Support Options: