Sample commands to export your ArcGIS Desktop schematic diagram feature geometries and import those geometries to your new ArcGIS Pro network diagrams
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ExportDiagramGeometry_Binaries.zip
ExportImportDiagramGeometryCommands_SourceCodeFiles.zip
ImportDiagramGeometry_exe_Binaries.zip
ImportDiagramGeometry_ProAddIn_Binaries.zip