As a software license administrator, you can convert ArcGIS Pro licenses acquired through ArcGIS Desktop to Single Use licenses if the corresponding ArcGIS Desktop license is Single 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 Single Use licenses.
For more information, open the My Esri help and go to Common Questions and Guided Help.