To Specify Units for a Parameter
By default, a new parameter is created unitless.
1. In the Parameters dialog box, click to add a parameter.
2. If the Units column is displayed, click the cell under Units and select a unit from the list.
To select from a refined list of units, do the following:
1. Right-click in the Parameters dialog box and click Insert Unit from the shortcut menu.
2. From the Select Units dialog box, select the measure type under Type, select the unit from the filtered list, and then click Select.