On WP8, this is not possible.
If you are talking about Windows 8, you can move an entire group of tiles. To do so on a touch screen, zoom out on your start screen (pinch) and then pull the group down and move it to where you want it. On a non-touch screen, I suppose you would have to roll the scroll wheel to zoom out? Not sure about that, but it's the same process. Get to the zoomed view of the start screen, then pull the group down and drag it to where you want it.
Note: the process of naming a group of tiles is similar to this. Zoom out on the start screen, then pull the group down to access the 'Name Group' setting.