Symmetry axis not present in pre
 

I AM CREATING A 2D approximation of a axial plane in a vertical pipe geometry.
A slice with just one node in the triangular cross section.

I would like to have in the pre processing the following 2d regions:

WALL
INLET
OUTLET
SYM (formed up by 2 surfaces, the axial cutting planes)
SYMAXIS (the simmetry axis at the pipe centerline)

How should I define this line to be able to import it in ANSYS CFX PRE and let it appear as a 2D region that is than possible to define as a symmetry boundary condition?