Hi Kayaker,
when I need switchable horizontal assisting geometry, I create a new storey therefore. I draw lines in the ground, I can separately switch them off, and I can change their height in the building by changing the height of the storey.
I can do the same with vertical geometry by using tiny walls with the only purpose to carry lines, points and arcs, and show them in the 3D building. Even when I push the wall, it's assisting geometry will also move with it.
You see, storey lines are more flexible than Dicam lines.