Access Database Question

Hi Guys,
I am new to Access. Currently I am building a database of oil
pipelines. So each record is a particular oil pipeline with related information
such as toll, origin point(City), destination point, type of crude so on.


My problem is one of main task is that User can just pick a origin point
A and a destination point B, the database can return a route or multiple routes
to get to B from A.
Usually, there is not a single pipeline can get you
there, it has to connect to several other pipelines. In some cases, you may have
different routes that all can get you from A to B but at different costs (sum of
total tolls).

I have no clue how to make that functionality happen. I am
really appreciated if you guys can provide some suggestions. Thanks