Estimate reject reasons are possible reasons that a customer may have rejected an estimate that they have been provided with.
Adding an estimate rejection reason:
First, go to your system settings.
Scroll through and select 'Estimate reject reasons'.
You will see a form on the left-hand side and a list of existing reject reasons on the right-hand side. You can add your new estimate reject reason on the left and it will appear on the right when you click 'Add estimate reject reason'.