Call me clueless but, by my experience, putting an edge on the parting tool is very simple. Since you are sharpening it from the side and will only have a very small cutting surface, just rest the tool down on the wheel and do a small grind. It won't be perfectly square but it doesn't have to be.
Just curious, by your post, how you are sharpening it. Looking at the grinder, you should have the base of the tool in the wolverine, and you should be looking at the thin edge of the tool. you should rest the ground edge against the wheel (with it off) with the wolverine set so that the edge alignes with the wheel relatively flatly. When ground, the tool will look like a slightly curved arrow point (the slight curve is due to the grinding wheel being round and grinding the edge to match it's curve). No other squaring is required. Your cutting edge is only 1/8 inch wide and the curved ground side of the tool is the bevel.
Good luck,
dietrich