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I appreciate you for sharing your thoughts with us, pdxsparky1.
Adding the Change Order option for estimates is a great idea. We'll let our Product Development Team know about this. They'll evaluate and might put in into consideration for product updates.
For now, you can only edit the estimates manually to see the changes.
Your feedback and suggestions are important to us. This'll help the product improve to suit your business needs. We got your back if you have other concerns in mind.