Employee XREF

There is an enterprise datasource that brings in a number of productivity metrics by employee code.  At a building level, I have a cross-reference file that can match up the employee code with their cost center and operations manager in my building.  I am unable to modify the enterprise datasource, but need to create a card based on that information and my XREF table to produce metrics by cost center and operations manager. Is there any way to do this?  I do have the ability to create my own datasources in our configuration, but do not have access to the underlying data that creates the enterprise datasource.