Hi @Corey,
thank you very much for your support.
The workflow is also working for me, but how do I know if company names are assigned correctly to a cluster?
Attached you will find my workflow:TFTest1.knwf (302.5 KB)
I thought that i can get the same result as mentioned here Renaming a string in a row based on another column
Could you help me out?
Thanks 
Canan