How do I copy a line without getting application error 10000, which prevents the document from saving?

Hello thomas-advantage,

I know how being able to copy lines can speed up your workflow and data entry, and it's great that you're looking to take advantage of that kind of capability while using QuickBooks Online. Running into errors can sometimes happen since QuickBooks Online is a cloud platform, but that's okay. I can help you sort this out.

When you encounter errors, a key part in figuring out how to resolve it is knowing exactly where you're working in the program and clarifying the steps you're taking. I appreciate you sharing the error you're getting though, and I have some troubleshooting steps I can share with you to try to resolve it. Since the error you're seeing specifically mentions an "application error," my first recommendation is to be mindful of how you're accessing QuickBooks Online. If you're using the QuickBooks Online app for Windows/Mac, using a browser is a better option since the app for Windows/Mac has been discontinued and may encounter issues such as this. Check out our System requirements for QuickBooks Online, Accountant, and QuickBooks Self-Employed page to see supported browsers.

If you're already using a browser, please take the following troubleshooting steps to ensure that cache, browser, and internet issues aren't the culprit here. Go through them one at a time to see if they resolve the issue.

• Clear browser cache if using a browser
• Try a private browser window
• Try another browser type
• Make sure you're using a supported browser and system
• Reset your Internet or try on another computer or device

Should the error persist, I encourage you to connect with the QuickBooks Online support team outside of this community forum. That way, we can clarify where you're working in the program and what steps you're taking. A member of our team will also gather other details needed to figure out how to resolve this and you can even share the steps you've already taken. Here's how to reach us.

Schedule a Callback or start a Chat: click (?)Help in the upper right in QuickBooks Online > type and enter "Contact support" into the QB Assistant > click Contact Us > explain your situation > click Let's Talk > choose Get a callback or Start a Chat.

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Support hours are from Monday to Friday between 9 a.m. and 8 p.m. ET.

Don't hesitate to give us a shout!