I know the absence of this feature has been so hard for you, Simon.

The ability to change the service or product on your invoice line without deleting the information in the description, rate, and quantity is a great functionality that'll help save more time. As of now, this feature is unavailable in QuickBooks Online.. Sending feedback is a great way to help us improve the program's features.

Here's how:

1. Go to the Gear menu and then select Feedback.
2. Type in your feature request in the description box.
3. Once done, click on Next.

You also can track feature requests through the QuickBooks Online Feature Requests website.

Additionally, I've added these articles that'll help you restock, track and manage your inventory in QuickBooks Online: 

• Reorder Inventory or Supplies from Vendors
• Use Reports to See your Sales and Inventory Status

I appreciate your understanding on this matter. Please know that we're determined to get this resolved.