1. Go into the booking and select the Customer payments tab.

2. In the field Enter custom payment add a description, which makes sense to you, e.g. Transferred payment to booking 1234.

3. Select the date next using the calendar icon.

4. Select the payment type you want to use. This could be e.g. Bank transfer.

5. Enter the amount you want to record.
Keep Payment selected as an option.

6. click Save.