The Selection Manager enables you to create a new selection and add entities to it. Both of these tasks can be accomplished either by creating a new object ISelectionInfo or by directly using a list of entities.

To create a new selection using a new object ISelectionInfo:

face = ExtAPI.DataModel.GeoData.Bodies[0].Faces[0]
selection = selection_manager.CreateSelectionInfo(SelectionTypeEnum.GeometryEntities)
selection.Entities = [face]
selection_manager.NewSelection(selection)

To create a new selection using a list of entities:

face = ExtAPI.DataModel.GeoData.Bodies[0].Faces[0]
selection_manager.NewSelection([face])

To add entities to the current selection using a new object ISelectionInfo:

face = ExtAPI.DataModel.GeoData.Bodies[0].Faces[0]
selection = selection_manager.CreateSelectionInfo(SelectionTypeEnum.GeometryEntities)
selection.Entities = [face]
selection_manager.AddSelection (selection)

To add entities to the current selection using a list of entities:

face = ExtAPI.DataModel.GeoData.Bodies[0].Faces[0]
selection_manager.AddSelection([face])