I think track settings or wherever you would set the grid settings, you would just select x-axis and leave y&z cleared. Then before copying your object click on it with R3 to set the grid to that object, copy it, and then when you click to align the copied object it should only align to the x axis of the grid.
Another option is to change the grid size to something very large like 5 meters, then align the grid to the object you want a copy, then when you copy the object and try to align it to the grid it will snap to the same 5 meter increments as the original if that makes sense.
1 people found this helpful