You can easily group elements so that it's easier to reposition them as a single unit.
First, select multiple elements (either click and drag a box around all the elements on use Cmd/Ctrl-Click to select multiple items) and then double-click on one of the selected elements.
You'll then see the toolbox open. Click the "Group" button.
Now you'll see that your elements have been grouped so that you can move them together.
If you want to ungroup, just double-click the element again and click the "Ungroup" button.