Hello I would Like to add my other Company's Login to my other company's User ID so that I dont do Multiple Logins

Hi there, @usergilbert.

I'd be glad to help you manage your company login in QuickBooks Online.

You can change the use one user log in with multiple companies in QuickBooks Online by creating the other User ID as an admin and changing it to the Master admin. Here's how to do that:

1. Login to the QuickBooks company you would like to permanently use its user ID.
2. Invite the other user ID or email to your company as a Company Admin by navigating to the Settings. This is how it looks like:

Check your email and accept the invitation to be able to access the other company and change the email. To know more about the process, you may check out this article: Sign in to multiple QuickBooks Online companies with one user ID.

I'll be here if you need anything else. Just let me know in the comment section below. Take care and have a wonderful day.