RB click each part or hold RB and scan over everything. from there you can either move all the piece or rotate each piece selected on their own axis. If you weld all the pieces together you can then rotate all the piece at a central axis.
If you've already got a group simply using RB to select one of the pieces of the group will grab the entire group. To make a group, select multiple pieces then press X to enter the menu and one of the first options is create group. If you've selected multiple pieces and want to move them all at the same time you must make them a group first or they will affect each other.