Hi mate...if you want to snap them all to an axis etc you have to turn off "retain component spacing" in the 'move tool' settings otherwise the verts will snap to the grid but still be out of line..double click on the 'cone' shape with arrow icon on the left...then the tool settings should pop up.
cheers bullet
bullet1968
"A Darkness at Sethanon", a book I aspire to model some of the charcters and scenes