How can I put 2 different company's on 1 mobile app

Good day, @accounts-jdwsecu.

Thank you for posting here in the Community. I can share information about how you can access two different companies in the QuickBooks mobile app.

Each company in QuickBooks Online has a separate paid subscription. I recommend you use one email address or user ID to avoid signing out and signing in again.

Once you have them under one account, you'll be able to switch between companies (see screenshots below). It's easier and more convenient on your part too.

If you're using more than one email address or user ID for different QuickBooks Online companies, you can make things easier by using one to sign in to all of them.

The first step is to send an invite. Choose the email address you’d like to use for all your companies. We’ll call this email A. The email you no longer want to use is email B.

Here's how:

1. Sign in to one of your QuickBooks Online companies that you access with email B.
2. Invite email A to the company. When you invite email A, you select a user type. Choose Company Admin if you want email A to be able to manage other users and company info. Note: If you can’t invite other users, you need an admin user to send the invite.
3. Go to your inbox for email A and click the invite link you received there. Email A can now access the company.

After following Step 1, you can proceed to Step 2 (optional only). Here's the link: Sign in to multiple QuickBooks Online companies with one user ID.

Additionally, I've included a link you can use in the future if you need to update the primary admin in QuickBooks: Change the primary admin user in QuickBooks Online.

Keep in touch with us in this public space for any questions you may have with your companies in QuickBooks. The Community and I will be sure to get back to you. Have a great day.