Hi,
1. Create a new bank journal for the payment method (e.g. credit card).

Configuration needed:
- Name, Short Code, Bank account (the account should have the type 'bank and cash')

->  If you want to create/import our credit card statements: the setup above is sufficient

-> If you don't want to manage the credit card statement through your journal :

Go in the 'Payments Configuration' tab and put the 'Credit Card' account in the fields 'Outstanding Payments' and 'Outstanding Receipts'.

2. Register payments using the credit card journal on your vendor bills
3. Create a reconciliation model for your Bank journal with the following set up:
- Create a write-off when clicking on the button
- Counterpart = Credit Card account

4. When you receive your bank statement, you will only see the whole amount of the credit card transfer at the end of the month and not the detailed transactions.

Use the reconciliation model in the manual operations tab and validate the reconciliation

4'. If you manage your credit card statements in the credit card journal, create/import them and reconcile the statement lines with the credit card payments you created at point 2.

5. Go in the Accounting menu > General ledger -> search for the credit card account

Select the items from the credit card payments and the items from the bank statement reconciliation and click on the reconcile 'button'. As a result, your credit card payment is now linked to both the vendor bill and the statement even though the payment and the statement come from two different journals. 

Hope it helps,