Edit or Delete MuPAD plots

Hi, I'm trying to write some MuPAD code which responds to a user input input() and would allow an existing plot to be modified / edited. The original plot could even be deleted and replaced by a new one. Is this possible, I can't see how this would be done? Note that I don't want to manually edit the plot through the Object Browser, rather the code should be able to change an existing plot in response to the user input. Thanks