Can I add New functionality in Default User Management

I would like to add some features like Plant selection and Machine selection dropdown below roles in add user windows in default user management screen

can I add these functionality?

If it is possible Pl let me know how…

From what I can tell, you can do everything you want without changing the user management component, if that is what you are suggesting? From your question, I would go through the free videos on www.inductiveuniversity.com. That should answer a lot of your questions.