Can I link multiple jobs together in Job Cost?

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Yes, You create a Project which is basically a Business unit (Parent Job)created in the P510063 Job Master Revisions. Then you create the jobs you would like to associate with the Project. As the jobs are created the project number is attached to the job. You can attach the project to as many jobs as you need.

 The Project Number field is defined as:  This field is optional and can be used to carry another valid job number that represents a "parent" to the current job.

On the Job Status Inquiry (JSI)you can also look at the data based on the Job or Project. In the JSI there is display options and the 'proj' allows you to select if you want to search on the job or entire project.