How can i edit a price for a service for a customer for an existing customer if the price has changed

I can help you change the price of a service, kellyannvan.

Beforehand, may I know what you mean about the customer for an existing customer you mentioned? Any information and screenshots added will help us resolve the problem.

In QuickBooks Online (QBO), you can modify the sales price of your service item by going to the Sales menu and selecting Products & Services.

Here's how:

1. Go to the Sales menu.
2. Select Products & Services.
3. Choose the item you want to run, and click Edit.
4. Update the Sales price/rate.
5. Hit Save and close.

Please know that changing your service price will only affect future transactions.

Additionally, here are some articles that contain information about changing, adding, editing, and deleting the product and service item in QuickBooks: 

• Change product and service item types
• Add product and service items

Furthermore, you can check these links to learn more about what you can do with invoices:

• How to Customize Invoices, Estimates, and Sales Receipts?
• Record invoice payments

Let me know if you have other questions about handling products and services in QuickBooks. I'm always here to help. Take care.