how to keep the game camera culling the same when moving the scene view?

A bit of a long title but... 3 cameras>

Main camera in scene
Game Camera view - from Main Camera
Editor viewpoint 'camera'.

When moving around the scene, the view effects the culling shown in the game camera.

Is there a way to set the scene view as from Main Camera - have that be displayed in the Game view and Then move the scene view and have the game camera culling stay the same?

'hope that makes sense.

(P.S. I've also posted this in the Unity Answer section - any help welcomed... _I'm aware of 'align view to selected and lock view to selected though)