Hi @carriew.
Let me add some details about merging QuickBooks Online accounts.
At this time, we're unable to combine two accounts in QuickBooks Online. In this case, you can only export and import the data, then cancel the other account to avoid extra charges and pay one account only.
I've added a link here for more insights on what account and data that you can merge in QuickBooks: Merge duplicate accounts, customers, and vendors in QuickBooks Online.
Keep me posted if you have additional questions about merging accounts and data. I'll get back to help. Have a great day ahead!