Having a little trouble understanding the post, but it sounds like you are trying to do something with slicing that slicing is not designed to do.
Slicing would mean that you want to make something 2" thick, but you only have 1" thick material. You would use the 1" material and make 2 pieces that are 1" thick - then glue the 2 pieces together to make the 2" thick part you want.
There is an excellent tutorial on slicing - 3rd one down from the top.http://support.vectric.com/training-material/cut3d
The tutorial is a FAR better explanation that we could do here on the forum