You can assign tags manually in Diagrammer or automatically, to all the objects in a cluster. Follow the instructions below
to assign tags manually.
Select the objects you want to assign tags on the diagram canvas and click
Assign Tags in the right-click menu. The Entity Tag Browser window opens.
In the Entity Tag Browser window, select the tag(s) you want to assign and click
Assign.
If you are assigning a tag to a legacy source file, check
Apply to Derived Objects to assign the selected tag(s) to all objects generated from the source file.