How do I enter an expense already paid from from a different account than the one connected to Quickbook?

Depends on how that payment was made and what type of business entity you are.  

Assume this was was business vs. personal expense.

Paid by personal cash, check or CC?  

Sole Proprietor, S Corp?

Good day, john-turner-pdnl.

I'm here to share with you how to record paid expense transactions.

The first thing we need to do is to create a new account to show where the money comes from. Then, we can transfer the funds to the account that's already on your QuickBooks. You can follow these steps:

1. Go to the Accounting tab and select Chart of Accounts.
2. Click New. Select Bank as the Account Type, then enter the required details.

3. Select Save and close.

Once done, we can transfer the funds.

1. From the + New button, click Transfer.
2. Select the newly added account under Transfer Funds From drop-down. The Transfer Funds To should be the account you want to use in recording the expense.
3. Enter the amount and other details. Click Save and close.

We're almost there! The last thing we need to do is record the expense transaction.  Simply go to the + New button and select Expense. Select the Payee, Payment account, enter the details, and click Save and close.

You'll want to check these links for more details:

• Enter, edit, or delete expenses in QuickBooks Online
• Categorize and match online bank transactions in QuickBooks Online

Leave a comment below if you need anything else. Stay safe!

@Teri Please help with this same question. 

Our business is a S-Corp.  The expense was made using a personal credit card that is not linked to the business.