If you have created a Job without using a Job script, you can always visualize the script of the Job and edit it.
For more information about Job creation without Job script, see Creating a Job.
To display a Job script, do the following:
In the Respository tree view, double click the Job you want to open.
Click on the Jobscript tab situated under the design workspace to view and edit the script if necessary.
From this view, you can visualize and/or modify all the elements of your Job: the script version, the context variables, the Job parameters including project information, Job settings, and routines called in the Job, the names of the components, their schema, their parameters, the connections used to link them, their position, the text notes added to the Job (if any), the subjob information, etc.