Use the Surfaces page of the New Feature wizard to select surfaces that define the shape of the feature.
Add surfaces you want to machine to the list using the buttons:
Add from selected items — Select surfaces in the graphics window and click this button to add them to the list.
Delete from selected items — Select surfaces in the list and click this button to remove them.
Pick Surface — Click this button to hide the dialog and select a surface in the graphics window.
Hide surfaces when finish — Select this option to hide surfaces used to create the feature when you finish the wizard.
Preview — Display a preview of the feature in blue in the graphics window.