In UM 20.3, when defining any new scope into discovery, the discovery re-runs discovery for all existing scopes.
In large scale environments, this may take a long time.
In UIM 9.2 it was possible to discover single scopes.
Release : 20.3
Component : UIM - DISCOVERY
Missing feature in UIM 20.3
Therefore this feature will be delivered with UIM 20.4 planned for release on Q4 CY21.