Idea

@Arun KR, yes, there exists a simple method. You can delete a direction in the way you create a two way path between network nodes. Press the "q" key and drag the connection line between the two networks nodes you want to change to non-passing in the order of your desired direction.

You can change the properties windows between all of your network nodes, if you press the small black arows in the left bottom corner of the windows directing to left or right. Then you can set the direction of the path to the other connected networl nodes by marking in the list and changing the passing value..

At last you can look in the tree (view, main) to find the method that change the visibility of the network by clicking the path while holding the "x" key and adjust the code to change the passing parameter: You probably need this actions: delete NN a > NN b, activate NN a > NN b, delete NN b > NN a, activate NN b > NN a, starting from the beginning. But in my opinion the amount of mouse clicks doesn't differ much from the mouse activity to delete a direction by holding the "q" key down and dragging a line between network nodes.