In addition to using predefined shapes for openings, you can create openings with custom shapes. You create a profile from a closed polyline to define the two-dimensional (2D) geometry of the shape. The profile is then extruded when it is applied to an opening. You can edit the profile to change the shape of the opening. You can then save the changes to the current profile or to a new profile. You can apply the profiles you create to any openings.