Hi Sandeep,
The field Shipping Type signifies whether the shipment will be by road or air or other means of transport. Shipping Type is selected for the transportation of the goods for the shipment legs.
If you are not maintaining the Shipments legs then you need not provide any input here.
You can configure Shipping Type through the following path :
IMG - LE - Shipping - Basic Shipping Functions - Routes - Define Routes - Define Shipping Types
Shamik