Contract Headers for every job have some 'Role names', which are greyed out by default. 

These can be populated by setting the appropriate value in  the 'Assigned Roles'  section.  

If you don't see the right list of options under the 'Role' Section. Please contact your administrator. 

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You can also create custom assigned roles by going to Admininistration -> Users -> Security Roles ->and ticking  Is Job Role