Can a multipatch feature be directly converted to a line feature in ArcGIS Pro?

No, a multipatch feature cannot be directly converted into a line feature in ArcGIS Pro. The feature, which is derived from a 3D model, must first be converted into a 2D polygon footprint using the Multipatch Footprint tool. The polygon footprint is then converted into a line feature using the Polygon To Line or Feature To Line tool, and the workflow is provided below. Converting it to a line feature makes the resulting boundary edges available for network analysis, topology validation, and other workflows that require a linear geometry representation.

1. Create a 2D polygon footprint from the multipatch feature using the Multipatch Footprint geoprocessing tool. Refer to the first workflow in How To: Convert 3D features to 2D in ArcGIS Pro for instructions.

The polygon footprint is displayed on the map.

2. Insert a new map.
3. Add the polygon footprint created in Step 1 to the new map.
   1. In the Catalog pane, click the Project tab and navigate to the geodatabase of the project.
   2. Right-click the newly created polygon footprint and select Add To Current Map.
4. Convert the polygon footprint into a line feature.
   • Use the Polygon To Line geoprocessing tool if one line per shared boundary segment and the LEFT_FID and RIGHT_FID fields (polygon IDs on each side) are required. However, it does not preserve input polygon attributes in the output.
   • Use the Feature To Line geoprocessing tool if preserving the attributes is required by checking the Preserve attributes parameter.

The line features are displayed on the map.