You can watch how the editors work on my youtube channel.
https://www.youtube.com/channel/UC24cYXoYowcSJxiTuRbLJZg
This editor creates multiple prefab by Multiple Prefab Creator .
Use it to create Prefab or prefabs from the selected GameObject(s).
It will be placed in you want which folder.... you have to write it's name to "Folder name" at Multiple Prefab Creator Window
if you selected gameobjects and you want to shortcut for create to prefabs you can use Ctrl+Shift+Alt+P .... This shortcut direct create prefabs
you can open Multiple Prefab Creator window , you have to click Multiple Prefab after click Multiple Prefab Creator Window at Menu if you can want to shortcut for open Multiple Prefab Creator window , you can use Ctrl+Shift+Alt+O...
if you did write an uncreated folder name , Multiple Prefab Creator won't create prefabs
if you didn't write name of folder , Multiple Prefab Creator creates your prefabs in Main Assets Folder.
You can watch "how work MultiplePrefab " on youtube : https://youtu.be/dUOLEF-7jNM
I coded an editor to easily edit the names of objects in scenes with a lot of different objects.
This Code checks if pivot and geometric center at same place