As a software license administrator, you can convert ArcGIS Pro licenses acquired through ArcGIS Desktop to Concurrent Use licenses if the corresponding ArcGIS Desktop license is Concurrent Use. Licenses are converted in My Esri. ArcGIS Pro Named User licenses that are acquired as GIS Professional user types or as add-on licenses can't be converted to Concurrent Use licenses.
For more information, open the My Esri help and go to Common Questions and Guided Help.