If I understand the question you just want to display the "priority" to the Employee interface, is this correct? You should be able to do this by using Web Screen Painter to customize the detail_cr (or detail_in) for the Employee form group, and add a "read only field" which references the Priority column.
I'm not sure if it would perform the calculation on the fly though, there may be a need to have a java script to perform that action.