I receive 2 invoices from QB for my account. I only use QG for 2020 account. Can I consolidate accounts for one billing?

You will need a 3rd party tool to migrate data between QBO accounts.

https:// transactionpro.grsm.io/qbo

Thanks for joining the Community, william31.
 

Currently, there isn't a process to merge accounts. If you have two subscriptions and don't want to receive invoices for the one you're not using, it can be cancelled.
 

Here's how:
1. Log in as an admin user.
2. Go to your Gear (⚙) icon, then Account and Settings.
3. Open the Billing and subscription tab.
4. Click Cancel subscription or Cancel Online.
5. Hit Continue to Cancel.
6. Choose Submit and cancel subscription.
7. Select Got it.

I've also included a visual guide:

Now the subscription you chose to cancel will be discontinued.
 

I'm including a couple resources  about using QuickBooks Online which may come in handy moving forward:

• Cancel a subscription or trial
• QBO Help Article Archives

I'll be here to help if there's any other questions. Enjoy the rest of your day!