Item entry payable by customer but should not be included in sales

How can I add an item entry, e.g. gate fee, to be included in the printed receipt payable by the customer, but should not be included in the sales report as the gate fee is initially provided by the store?

For example:

Order:

1pc coffee - 95

Gate fee - 10

Total - 105

105 will be the total payable of the customer but only 95 should be in the sales report as the 10 will be used to pay for the gate fee for the delivery.

I hope i had explained this thoroughly and hoping to get some help on this matter.

Thanks.