Experiences - How can I add a miscellaneous cost to the invoice?

In the booking process, and on the invoice, fees are charged for tours, extras, discounts, base adjustments, and taxes.

However, we sometimes add a surcharge if the pickup/drop off location for a customer is outside the main town. I can't see a way of adding this into the reservation, and onto the invoice.

I am aware I can add the payment via the payment history, but would also like to add the surcharge details to the invoice.

If this isn't currently possible, please add this post to the features requests section. It would be handy to have the facility to add repeating records for this, in case there are more than one type of surcharge. Some charges can be added as extras, but something like pickup/drop fees are very varied.

Thanks