6.3.1.10 Nominal Type Variable To define a Nominal type of variable: Select Nominal in the Variable Sub Type drop-down menu. Select a hierarchy from the Select list of values drop-down menu. Select a logical reference from the Logical Reference drop-down menu. To add dimensions, select Yes. Else select No. If you select Yes: Select a dimension from the Select Dimensions drop-down menu. If you select No, then move to step 10.