Thanks for checking in with us, pckbespokedesign.

Not being able to customise your estimate number in QuickBooks Online is usually the result of outdated or corrupt cache files in your web browser. Not to worry, you can clear them in just a few easy steps.

We can press the F5 key on your keyboard to refresh the page. If you're still unable to customise the number, we can do some of the basic troubleshooting steps. Use these keyboard shortcuts:

• Google Chrome: press Ctrl + Shift + N
• Mozilla Firefox: press Ctrl + Shift + P
• Safari: press Command + Shift + N

Once signed in, let's go back to your estimate screen and customise the number.

If the private browser works, you can clear the cache depending on which browser you're using through this helpful article: Clear cache and cookies to fix issues when using QuickBooks Online.

For your reference, you can take a look at the following write-up to help guide you with utilizing your templates in QuickBooks Online as well as on what other information you can add: Customize invoices, estimates, and sales receipts in QuickBooks Online.

Let me know the result of this troubleshooting in the comment below. I need to make sure this is resolved and you're back to running your normal business processing. All the best!