I'd like to better understand licensing users for Portal for ArcGIS. My organization has 20 available Creator (level 2) user types. If I decide to "use" 5 of the 20 when creating a Portal for ArcGIS license, but then later realize that 5 is not sufficient, will I need to create a new Portal license within My ESRI? Or, is it possible to add say a 6th and 7th Creator without generating a new license, possibly in the Portal interface. I have not yet used Portal for ArcGIS so I do not know what capabilities exist.