I think that is what the cam software is for. Viacad is for creating 2d and 3d drawings that you then export to your cam software set up the engraving design to transfer to the gcode.
It will import dwg files.
if you are doing complicated engraving designs you may want to sart in an art package like adobe illustrator and then transfer the .ai file to via cad to clean up and transfer to dxf or stl.

Bruce