Can I manually enter old credit card transactions that my bank no longer has electronically?

Hello @sgretch,

Welcome to the Community. I'm here to help with manually entering credit card transactions. 

QuickBooks Online offers the ability to manually enter transactions, including those associated with a credit card. Here's how:

1. Select the Plus icon.
2. Click Expense.
3. Choose the credit card account in the Bank/Credit account drop-down.
4. Enter the additional information about the transaction.
5. Click Save.

For information on entering transactions into the register, I recommend the following article: How to Add or Edit Transactions in a Register (or Account History). 

Additionally, you may wish to consider entering the transactions into a spreadsheet and uploading them into QuickBooks Online. You can locate information on this process, as well as steps, at the following link: How to Import Bank Transactions Using Excel CSV Files.

That'll do it. I'm confident you'll have these old credit card transactions entered in no time.

Let me know if I can be of further assistance. Wishing you well.