Select Multiple Class Names
If you click on the '... ' option from a constraint drop-down list, the Select Multiple Class Names dialog displays as shown below. This allows you to assign multiple values to a constraint field. For example, if you are creating a spec section and only want to include pipe components with Schedule values of 40 add STD, you are able to do it using this dialog.
Select the values you wish to apply to the constraint and press OK. The spec section will be updated to reflect the new constraint values.