unity - How can I make a custom editor that creates/deletes game object clones around a given point

I have been manually creating and deleting clones of my game objects that I arrange in a circle around a given point. Each of the objects is rotated making each object the same angle apart from the others as seen in the image below.

My objects range from 2 to 10. Doing this manually is very cumbersome, especially when changes have to made. How can I create a unity custom editor that allows me to specify a number of game object clones I want to create around a specified anchor point? Additionally, adjusting the number of clones should dynamically create/delete clones and reposition/rerotate them.