In ArcGIS Pro Users can currently export 3D Scenes from ArcGIS Pro directly to portal but exporting models to ArcGIS Online is a fairly manual process with several steps.
The "Batch Export 3D Models from ArcGIS Pro to ArcGIS Online enables esri users to easily share all 3D models placed and symbolized in the Contents panel of ArcGIS Pro directly to ArcGIS Online.
