The Array Device (2 Point) command is used to array devices on the drawing in a straight line from the first device to a second point.
Use this command instead of the standard CAD ARRAY command.
To array devices using the 2-point method, go to
Ribbon: DM Electrical->Devices-> 
Array Device (2 Point)
Pulldown Menu: DM Electrical->Modify Devices->Array Device (2 Point)
You will be prompted to select the devices to array.
Select devices to array:
You will then be prompted to specify a second point for the array. The distance between the specified point and the first device will be divided evenly among the devices in the array.
End point of array:
You will then be prompted to specify the number of devices in the array, including the selected device.
Number of devices in array (including selected device):
The devices in the array will be generated in the space between the selected device and the end point.