Align to Global Axes
Align objects on the x-y, x-z, or y-z world planes or along the x, y, or z axes.
If the object that you want to align has construction
            history, you need to select Edit > Collapse Construction.
        - 
                Select one or more objects.
                Note:
- To select multiple objects, use box selection or hold down Ctrl while clicking the objects.
 - To chain select in the Model Browser, hold down Shift while clicking the names of the objects.
 
 - 
                Open the Move tool:
                
- Press W.
 - From the Home tools, click the
                                Move icon.

 
 - 
                In the Control Panel, select Align to Global Axes.
                In alignment mode, the manipulator disappears, and intersecting red, green, and blue lines are displayed to represent the x, y, and z axes. The position of the alignment axes depends on the first selected object.
 - 
                Align the selected objects:
                
To Do this Note Align along an axis Drag the Align X, Align Y, or Align Z point. Alignment axes can be parallel to the x, y, or z world axes. Align along a plane - Drag the Align X, Align Y, or Align Z point. Now, only two alignments points are available.
 - Drag the Align X, Align Y, or Align Z. The tool returns to Roto-Translate mode.
 
Alignment planes can be parallel to the x-y, x-z, or y-z world planes passing through the pivot point of the first selected object.  - Right-click and mouse through the check mark to exit, or double-right-click.