3ds Max :: Cropping A Scene In Half

I'm new to 3ds max (and 3d modelling) so am possibly just superimposing my 2D graphics skills onto the 3D realm, but, here's a shot.

I've got a very complex scene, a room with walls, a floor any many objects inside. I want to simply select half of the visible room from a top viewport and simply cut it out (crop). The problem is some of the objects span across the whole room and they get removed completely rendering me with less than half of the room. Is there some function which simply removes the object wholly if it is completely in the selected area, otherwise just partially cut out the section that is selected if the only part of the objects area is selected?