Sometimes there are occasions where you might need to add a one-off charge to a contact or to a booking. And this is the place to find out how you do it.
If the one-off charge relates to a booking head over to the specific booking. If it relates more generally to a contact go to the specific contact. The process is the same either way.
When you're in the right place, select Edit in the Charges section. At the bottom of the list of charges you'll see the Add Charge button. Select that, fill out the details adding both a quantity and unit price and Save. The one-off charge will then be added to the list of charges on the date that you add the one-off charge.
Here's a screencast of the process.