Slice Plane Orientation Relative to Object

[MegaPixel]

http://www.cgarchitect.com/forum/filepush.asp?file=Clay1.jpg

 

http://www.cgarchitect.com/forum/filepush.asp?file=Clay2.jpg

 

 

http://www.cgarchitect.com/forum/filepush.asp?file=Clay3.jpg

 

 

Ok, My question may sound dumb but here it goes. I wish to know how to make my Slice Plane orientation (When in Edit Mesh Sub-Object Mode) default Normal to my View or relative to the World. Currently, the Slice Plane remains relative to the original Clay Tile Mesh I made before Arraying and Rotating it. I have tried to manipulate it's Pivot Orientation and such in the IK Modifier Toolbar but so far that hasn't done the trick yet. I know what your thinking - Your thinking why not just figure out how far you need to rotate the Slice Plane as is and go from there? I "Could" do that but I have to repeat this procedure several times and at multiple roof pitches. Oh and incase your wondering why I'm slicing this baby, It's to avoid the nasty boolean subtraction outcome. I get better results just removing the sliced geometry from my mesh. Thanks for any help you may have - MegaPixel