You can create separate expense transactions to split those payments, userkatie. I'll be glad to walk you through the process.
Since the sources of these payments are from different accounts, you need to create two separate expense transactions to record them. To do so, please follow the steps below:
- Open your QuickBooks Online.
- Go to + New, then select Expense.
- Select a vendor from the Payee dropdown and select the account you use to pay for the expense in the Payment account.
- Add the necessary information.
- Once done, enter the expense details in the Category details section. Make sure to select the correct Category to accurately track this transaction.
- Enter its correct Amount.
- When you're done, click Save and close.
After completing your first transaction, repeat the steps to create your second one.
For reference, please see the screenshot below:

If you need help with refunding your vendors using QuickBooks, here’s an article that can assist you: Enter vendor credits and refunds in QuickBooks Online.
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If you have other questions about splitting expense payment or other vendor relates task, we'll be here to assist you, userkatie.