Let me share some clarification about adding a column to an estimate.
Currently, the option to add an extra column for the total is unavailable. As a workaround, you can utilize the customer message or footer text field for the information.
Here's how:
Open the estimate.
Click Customise at the bottom.
Select Edit current.
Go to the Content tab.
Click the pencil icon at the bottom.
Under Message to customer on or Add footer text, enter the information.
Hit Done.
I appreciate your input on this feature. We always update the features in QuickBooks Online, and this preference might be added in the future.
As we assess this, I suggest you visit our QuickBooks Blog to stay updated with all the changes that are being made.