Hi @BOMMISETTYN16612583, 

You cannot exactly pass the dataflow name dynamically as a Param because any the time of saving the activity the rule lookup of the step will fail as below.

Practical way to achieve this is to use WHEN and JUMP in activity steps, which gives you complete control on when to execute which dataflow and what to do post execute.

You can also parameterize this activity and use the param in When of step dataset-execute method. 

Hope it helps !

Thanks, Ankit