QBO periodically will allow me to create an estimate, but then the save button will not un-gray out. It only does it in random customer records. Very annoying.

Hello there, @Skottydawg1.

This isn't the kind of experience I'd like you to have with QuickBooks Online. But I appreciate you trying to troubleshoot the issue.

Since you still can't save the estimate using the mobile app, I recommend reaching our Customer Care team to help you investigate further the cause of this issue.

Here’s how:

1. Sign in to your QuickBooks Online company.
2. Click Help (?).
3. Select the Assistant tab to get started and get quick, personalized answers. Select a suggested option or type a question or topic you need help with. If you decide you need further help, you can still Talk to a human.

You can then choose a way to connect with us:

• Start a chat with a support expert.
• Get a callback from the next available expert.

In the meantime, you can log in and create an estimate using your browser.

Here's how:

1. Go to + New, then select Estimate.
2. Select + Add customer. Then, select a customer from the ▼ dropdown. Or, to add a new customer, select +Add new, enter the customer info, and choose Save and Close.
3. Click the ▼ dropdown in the Product or service field and add the products or services to the estimate. Or, to add a new product or service, select + Add new, enter the info for your product or service, and select Save.
4. If you saved a rate for your product or service, it automatically displays in the Amount column. Add or adjust the quantity or amount as needed.
5. The default status of a new estimate is “Pending”. If you need to edit the status, select the Pending ▼ dropdown and choose a different status.
6. To customize the estimate, select Estimate settings in the side panel and select the ▼ dropdown by each section to expand the details. Then, choose what info displays on your form by turning the switches on or off in each section. As you make changes, a preview displays on the form.
7. When you're ready, select Save.
8. To email the estimate to your customer, select Review and Send. Then edit the email message, if necessary, and select Send estimate.

Here is an article for the detailed steps: Create and send estimates in QuickBooks Online.

For future reference, I'm adding this article to guide you in converting estimates to invoices: Convert an estimate into an invoice in QuickBooks Online.

Don't hesitate to click the Reply button below if you have questions about managing estimates in QuickBooks Online. I'm always here to help. Have a great day.