Select Add Numeric from the drop-down menu at the bottom of the dialog box.
A new row is created at the bottom of the parameter list, and the cursor is positioned in the Parameter Name cell for that row.
Enter the name mass, and then click the Unit cell to display the Unit Type dialog box.
Expand the Mass node, and select lbmass.
Note: Parameter names in iLogic are case sensitive. Please be sure to follow the case being used in the Parameters dialog box, and while creating rules.
Enter 100 in the Equation cell, then click in another cell in the row and observe 100.000000 in the Nominal Value field.
Select the check box in the Key cell of this parameter to make it a Key parameter.