The Membership sheet of the Define Ad Hoc Index dialog, shown in the following image, is displayed when the dialog is invoked, to enable you to define the name of the ad hoc index and to select its membership.
To specify a name for your ad hoc index and its membership
In the Name text box, specify the name of your ad hoc index. The name must be unique within the current schema and superschemas.
In the Membership combo box, specify or select the membership of the class to be used for the ad hoc index. Collection classes, transient‑only classes, and classes that do not allow persistent instances are not available for selection.
Click the Next > button. Alternatively, click the Cancel button.
When you click the Next > button, the Keys sheet is displayed, which enables you to select the property or properties to be used for keys in the ad hoc index.