Aligning and distributing path components
You can both align and distribute path components that are described in a single path. For example, you can align the left edges of several shapes contained in a single layer or distribute several components in a work path along their horizontal centers.
Note: To align shapes that are on separate layers, use the move tool. (See Moving selections and layers within an image.)
To align components:
Use the Path Selection tool 
to select the components you want to align, and select one of the alignment options from the options bar: Top 
, Vertical Center 
, Bottom 
, Left 
, Horizontal Center 
, or Right 
.
To distribute components:
Select at least three components you want to distribute, and then select one of the distribute options from the options bar: Top 
, Vertical Center 
, Bottom 
, Left 
, Horizontal Center 
, or Right 
.