When creating or editing your logistics, you can price it to whatever makes sense for you and your business.
On a project you'll add two delivery logistics (one for pickup and one for drop off).
If you charge 100.00 for delivery (round trip) you can charge charge 50.00 for the delivery service, so when you add it for drop off and pick up, it'll charge 100.
Or, you can charge 100.00 for 'standard delivery' and override the cost of the pickup to 0.00.
Finally, you can create one service for 'standard delivery' to charge 100.00, and then create another for 'standard return' and charge 0.00.