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You'll need to have a separate QuickBooks Self-Employed account for each company. For a second company, you can sign up for a new QBSE account. Take note that you can use a different email for the new subscription.
In addition, every QuickBooks account is charged. You can refer to this guide to manage your subscriptions: Update your billing and subscription info in QuickBooks Self-Employed.
Feel free to visit this resource to learn more about the QuickBooks app: The QuickBooks App—take your business with you. This helps you manage your business on the go.
I'll be right here to help if you have further questions about managing your account. Have a great day!