Thanks for getting back to us, ELPope. I'm here to share additional details.

Transactions that are in your register are the ones that can be reconciled. If you want to add it to the register, you can add, match, or transfer it. For the detailed steps, please follow this article: Categorise and match online bank transactions in QuickBooks Online.

On the other hand, if you're for splitting journal entries, then, you may need to allocate the amounts for the specific accounts. I'd still suggest consulting your accountant for further guidance on handling this matter. This way, we can ensure your books are accurate in QuickBooks Online. 

Please let me know if need more help.