How we can setup the Skip level access in Position Structure, for employees within an organization unit.

Let us assume the following example.

I have an organization unit A with Position Structure as Sr. Manager > Line Manager > FTEs

Field Technician : 10

Line Manager : 1

Sr. Manager :1

I want to setup like: 

5 FTEs should be accessed by Line Manager (Sr. Manager will have access to Line Manager and his sub ordinates)

Other 5 FTEs should directly be accessed by Senior Manager (Line Manager should not have access to these 5 FTEs)

How we can setup the access for above scenario.