Quick 3DS Max question

Hi, im just starting out with 3DS Max and i think i have the basics down. Im trying to create a replica of HMS Invincible (basically im making an aircraft carrier), anyway im having trouble with the hull. Im box-modelling it, but what i wanted to know is; if i want to edit the vertexes or edges of one side of the box, can i have it replicate it on the other side? So say i was to move all the sides in at a certain angle, would i be able to make the other side match this? Its hard to explain, but i hope someone understands. Basically trying to make a symmetrical object...

Thanks
Tom

If your object is entirely symmetrical you can cut it in 2 and work only on one part then use the symmetrize modifier to create the other part.