You can group elements on a page together so that they can be moved, copied, resized, and oriented as a single element.
While elements are grouped you can't modify attributes of individual objects in the group, but you can update styles they may be using and those style changes will be reflected.
If you can't select an element or group of elements, it may be locked; you'll need to unlock it. To learn how, see Locking and Unlocking Elements.
Select the elements on the page you want to group, and choose Arrange->Group.
Select the group, and then choose Arrange->Ungroup. If the group is locked, unlock it first.