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 a line. You must select a line or linear landing curve. You cannot select a line string or a curve.
2
Select a surface or sketching plane.
Specifies a tracking point used to control the direction of parallel line placement when an ambiguity exists. The tracking point is used with the value selected by Track Flag. This value is optional.
The selected tracking point must be an existing point previously created with Insert > Control Point, Insert > Topological Points, or other geometric construction point interfaces.
Reject
Clears the selections for the current step.
Accept
Accepts the current selections and displays a preview.
Continue
Completes the geometric construction definition. The ribbon continues to display so that you can define parameters for additional geometry.
The geometric constructions are not created and saved to the model until you click Finish on the main command ribbon to create the model object.
Distance
Defines the distance of the parallel line from the selected line.
Track Flag
Controls how the tracking point is used when an ambiguity exists. Select Near to use the curve nearest to the tracking point. Select Far to use the curve farthest from the tracking point.