To import 3D Horizon data, select Survey - Import - Horizon - GeoFrame - 2D. The top part of the user interface corresponds to the GeoFrame access, where it is needed to specify the GeoFrame Project, Password, Survey name, Interpretation Model and select the Input Line Class and Input Horizons that you wish to import (For multiple selection of horizons hold the Ctrl key while selecting).

The bottom part of the user interface corresponds to the OpendTect access, where you need to select the Output Line Set and Attribute and then, specify the Output Horizon Name for the case of a single horizon import or the Output Horizons Prefix for the case of multiple horizons import. See Line Set and Attribute selection dialog for details of selecting the Output Line Set and Attribute.

In order to obtain the geometry information for each 2D Line of the selected Input Horizons, the list of 2D Lines that will be imported for the selected Input Horizons is determined by the intersection between the lists of 2D Lines of the selected Input Line Class and of the selected Output Line Set and Attribute, which means that if the selected Input Horizons contain no data for some of those 2D Lines, they will be imported as empty 2D Lines.