Estimating delivery distance

@kasunhp Check if the following field helps.

Quoting the help text

Distance
The distance for the delivery using the delivery mode specified by the ship via code. The distance value can be expressed in any unit of measure. This value will be considered during the sourcing process. 

also check

Sales\Transportation Administration\Supply Chain Relations\Site to Customer Supply Chain Parameters

Sales\Transportation Administration\Supply Chain Relations\Supplier to Customer Supply Chain Parameters

The requirement here is not very clear but hope this helps !