Hello there, Microscope.
I appreciate the detailed information about your concern. Allow me to add more insights into duplicating line items in the Estimate.
Currently, we're unable to duplicate a line item of an estimate in QuickBooks Online (QBO). I know it would be beneficial to have this feature to simplify the process. Worry less. I'll help you forward your valuable insight to our software engineers so they can consider bringing this option to the product's future updates.
To do that:
- Head to the Gear icon.
- Click Feedback.
- Enter your feature request, then select Next.
In the meantime, you'll need to manually enter the information in each line item of an Estimate.
I'm attaching this article for future reference in converting an estimate to an invoice: Convert an estimate into an invoice in QuickBooks Online.
Feel free to post a reply if you have clarification in managing estimates in QuickBooks. I'm always here to help you.