How do I record a cash payment to one of our credit cards? Thank you.

Thank you for posting here in the Community, @kathy37.

Let me help share some information about recording cash payments made on credit cards. 

There are several ways to enter credit card payments in QuickBooks Online (QBO). Since this is cash payments, you can use expense to record that transaction. 

Here's how:

1. Go to the New (+) icon on the left side.
2. Choose Expense under Vendors. 
3. In the Payee drop-down arrow, select a payee's name. 
4. In the Payment account and Payment method, choose a credit card for both.  
5. Complete the required information under Category details.
6. Hit Save and close. 

For more information about the process on how to enter payments in QBO, please browse this article: What is the difference between bills, checks, and expenses?. And proceed to When to record check or expense section. 

To see a report of income vs. expense for each customer, you can always run the Income by Customer Summary report from the Reports menu. Also, you can customize the report to show specific information. For more details about customizing, check out this article: How to Customize Reports: Basics, Sorting & Date Ranges.

See the screenshot below for your reference:

Please feel free to let me know if you have any further questions or concerns. I'm always here to help. Take good care. 

@kathy37 

To answer your question directly

You should have a bank type account set up for cash, you fund that account

then write a check, do not print this is only data entry, on the cash account and use the CC account as the expense (reason) for the payment