You can edit an existing program definition at any time. Any changes that you make to a program definition will not affect previously defined steps that use the program. If you want to edit a program definition that is already in use, you must edit the step that contains the program. Alternatively, you can delete the step from your process and recreate it after you edit the program definition, using the method described here.
To edit an existing program definition:
Change the settings for your program definition, as necessary.
Click OK to save your changes and close the notebook.
Related information:
Defining a user-defined program to the Data Warehouse Center