What is the difference between Built-In and Repository?

Built-in: all information is stored locally in the Job. You can enter and edit all information manually. 
Repository: all information is stored in the repository. You can import read-only information into the Job from the repository. If you want to modify the information, you must take one of the following actions:

Convert the information from Repository to Built-in and then edit the built-in information

Modify the information in the Repository. Once you have made the changes, you are prompted to update the changes into the Job.