I understand that editing existing products and creating new ones is central to your invoicing process, @tkatke. Know that your voice is valuable, and we appreciate the detail in your message. I want to reassure you that I'm here to provide the necessary support to help you solve this with utmost urgency.

I replicated this on my end. Upon testing, I was able to edit existing products without any issues and use the Duplicate button as well. Please ensure you complete all the necessary fields for a successful process.

Also, I would like to ask if you've encountered any error messages while trying to edit the existing products. Any additional details you can provide will help us understand the issue better and deliver the appropriate solution. 

If you have already filled out all the necessary fields, and yet are still unable to make the desired changes, let's open your account in a private window to rule out browser-related issues. Outdated or corrupted cached files can occasionally lead to unexpected system issues, which may have caused the program and feature not to work as intended.

You can do this by using the following keyboard shortcuts:

• Google Chrome and Microsoft Edge: Ctrl+ Shift + N
• Mozilla Firefox: Ctrl + Shift + P
• Safari: Command + Option + P

Once you're able to make the necessary changes, return to your regular browser and clear your cache for a fresh start. You can also switch to other installed supported browsers, which is a good alternative. 

Since you mentioned it was also happening in your mobile app,  let's refresh the application to isolate the problem. This process is similar to clearing the cache on your web browser.

For IOS users, please follow these steps:

1. Open your Settings, then tap General.
2. Tap iPhone Storage. Choose the QuickBooks Online app.
3. Click Offload App.

If you're using Android, here's how:

1. Proceed to the Home menu or tap the three dots in the right upper right corner.
2. Tap on Settings, then select Refresh Data.
3. Press Yes.
   
   

On the other hand, please note that our support hours are Mondays to Fridays, 6 AM to 6 PM PT. We also open on Saturdays from 6 AM to 3 PM PT. During these times, you can reach out to our expert team, and we will be more than happy to assist you with any concerns or issues you may have.

For future reference, if you have received payment from one of your customers, you can record it in QuickBooks. It will mark your invoices as paid, ensuring that your financial records are up-to-date and accurate.

I know that experiencing challenges editing your existing products affects your ability to work efficiently. Please let me know how it works after taking the troubleshooting steps. We are committed to offering reliable and efficient service to support your business growth.