We don't want you to have this kind of experience @CD41. I recognize the efforts you've made to troubleshoot and address your concerns. Let me route you to get the best assistance for your concern.

We always strive to ensure that QuickBooks users can perform activities without any challenges. I recommend contacting our QuickBooks Online Support Team again. They have the tools to start a screen-sharing session and investigate why the tab key has stopped moving to the next line item.

Here's how:

1. Log in to your QuickBooks Online account.
2. Click the Help (?) icon.
3. Select Contact Us and choose a way to connect with us:

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

For more information about our support availability, refer to this article: QuickBooks Online Support.

Furthermore, I recommend exploring these resources to effectively manage your QuickBooks Online account and streamline transaction creation:

• Customize invoices, estimates, and sales receipts.
• Manage billing, payment, and subscription info. 

I look forward to resolving your QuickBooks task efficiently. Please reply if you have further questions. I'm available 24/7 to assist you.