Select
Selects an existing geometric construction object, such as a curve or surface, to edit or delete.
Add
Selects geometry that defines a new geometric construction. This option is used with the numbered step options listed below.
Delete
Deletes a selected geometric construction.
Cancel
Cancels the macro, closes the geometric construction ribbon and the Geometric Construction Palette dialog box, and then returns to the main command ribbon.
Close
Verifies the validity of values selected for the options, closes the geometric construction ribbon and the Geometric Construction Palette dialog box, and then returns to the main command ribbon. The selected values are still available when you click again on the main command ribbon.
Geometric Construction
Displays the current geometric construction interface. You can also select:

A different, recentlyused interface.

More  Opens the Select Geometric Construction dialog box. For a new geometric construction, all interfaces delivered with the software are available. For an existing geometric construction, only similar interface types are available.
Geometric constructions displaying only in the Select Geometric Construction dialog box are not intended for general usage. You should first consult your Intergraph support representative before using these geometric constructions.
1
Specifies the first polyline crosssection. This is typically a crosssection at the end of a surface created with the Surface by Curves geometric construction.
2
Specifies the second polyline crosssection. This is typically the crosssection next to the selected end of the surface.
Specifies a line string joining equivalent vertices of the crosssections. This value is optional, and is only needed when the crosssections do not have the same number of vertices.
Cancel
Clears the current selections.
Accept
Accepts the current selections, and displays a preview.
Continue
Completes geometric construction definition. The ribbon is still displayed, and parameters for additional geometry can be defined.
Extension
Specifies the distance by which the first crosssection 1 is extended.