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Migrating your 2012 QuickBooks Desktop to QuickBooks Online will create a new company file and it will not be combined with your new QuickBooks account. Thus, you'll be paying for two subscriptions.
To create a new company file, here's how:
You can also use the same login credentials when creating a new QBO subscription. This way, you'll have access to all your QBO company file under one login credentials.
To switch your company file without logging out, click this article: How do I switch companies?
I've added our QuickBooks Online Getting Started page. It contains helpful articles that will guide you in managing your account in QuickBooks.
Keep in touch if you need help with anything else. I'm here to lend a hand. Have a great week ahead.
You should open your old company file on the trial license of QBD 2020 prior migrating to QBO.