Step 1: Change the status of the quote from "Accepted" to "Draft"
On your Quotes tab, click on the accepted quote you would like to modify
Click on the “Actions button at the top right of the screen
Select “Draft”.
Step 2: Confirm if you would like to void the attached invoices
If you say Yes: The invoice will be voided and appear on your reports at $0
If you say No: The original invoice will remain in the project
Step 3 : Make the necessary modifications to the quote and/or the invoice(s)
Make the modifications to the quote items
Make the modifications to the invoice items to reflect the changes in the quote items, if you have answered "No" in the above window