importance of lane in otm

Problem Description
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Whether it is mandatory to create each and every lane in otm with proper service time.
Suppose i have locations A, B, C and the lanes from A to B , A to C , B to C.

My question is here, after few days if I create another location D.
For OTM to plan and create shipment. I have to create lanes from A to D for Direct Shipment.

For multi-stop Shipment, whether i have to create lanes between all these locations.
e.g Shipment A to B, then B to D. Whether here i have to create a lane from B to D.

As we are Service Provider and serve our customer. It is hard to add daily new location and their lanes.

Thanks,
Amy