Continuous Move Questions

We have Scenario as below

Truck from Location A to Location B, Location B to C is deadhead. Location C to Location A.

Q. On my Rate offering under Continuous move tab do I need to define rule only for B to C or for all the three lanes?
Q. How can I allocate deadhead shipment cost 60% to shipment between A and B and 40% between C and A?

Any configuration or setup document will be of great help, please email me on huncain123@gmail.com

Your help will be much appreciated.

Thanks
Hun