Thread: How to add and delete items in a structure?

I am working in a project and I would appreciate if someone can give me some orientation to add and delete items in a database created using a structure. The project consists in making a program to manage the clients of a medical center.

So, I make an structure with each member variable. I declare a function to read all the data. I have to make a menu A, B, C, ... and after the user have registered all the clients, the menu should have an option to add more clients and another to delete existing clients. Is there any method to do that?

Thank you in advance.