Hi syngent!
Yes, it is possible to consolidate your subscriptions under one email. All you have to do is invite the email (that you want to use moving forward) as a Company admin on the QBO company you want to move. Then, you make it the Primary admin user.
For simplicity, let’s just say Email A is for Company A and Email B is for Company B (to be transferred).
Step 1: In Company B, invite Email A as the Company admin user.
Step 2: Accept the invitation.
Step 3: In Company B again, move the Primary admin role to Email A. Another email will be sent to Email A.
Step 4: Email A must accept the invitation to be the Primary admin.
Here are a couple of articles to give you more information about the process:
You can always reach back out if you have any other concerns with your subscriptions. Take care!