Thanks for posting your question in the Community, amandajdarley,
I'm here to provide information about how product and services feature works in QuickBooks Online (QBO).
If you’d like to enter a detailed description on the item list, right now it’s unavailable. The option you can do is enter it in the Description field.
To know more how product and services feature works, you can check out these articles:
However, if you mean something else, please feel free to reach back out and provide and more details. Have a great day!