Hi there, @nonyanon.
That's right! After you merge your account, QuickBooks moves past transactions from the duplicate to the account you want to keep.
Keep in mind that merging accounts is permanent. You can't undo this later on. For more insights, please see this article: Merge duplicate accounts, customers, and vendors in QuickBooks Online.
In addition to that, let me share these links to help you manage your accounts in QuickBooks:
Keep me posted if you have other questions about handling accounts. I'll be happy to help you again. Stay safe!
