Cosmos Express-Viewing interior details?

I have a assembly of 2 plastic parts that I am sonic welding together
to form a manifold assembly. I created a "joined" part, to allow
analysis with Cosmos (1 part vs assembly). I have applied a pressure
load, and want to examine resulting stresses. Works fine, but the
problem is that my peak stresses seem to be on the inside surfaces of
the part, as you would expect. Is there any way to do a section view
on the Cosmos works stress distribution output? Or, failing that, is
there any way to define symmetry within Express and do the analysis on
1/2 the part?

Thanks.
Brian