To set up a reference column in Tempo, click the ‘Table Settings’ button in the top right corner of the table. In the pop-up screen, click the Pencil on the column you would like to be your Reference Column, navigate to the ‘Special Column’ dropdown and select ‘Reference’. Click ‘Select Reference Table', choose your Reference Table, Display Column and Value Column and select ‘Apply Reference’. Now click the ‘Update Column’ button and ‘Save & Close’. Now your table has a reference column.