To Attach a Script to a Task

Select the Attach Script to Task tool.
From the Attach Script dialog Task drop-down menu, select a task to which the script will be added.
From the File drop-down menu, select the active file or a reference that will be attached as a script.
(Optional) In the Repeat Count field, set how many times the attached script will be repeated.
(Optional) In the Scale field, set the scale factor for the attached script.
Accept with a data point to complete the attachment.