Adding a new unexisting hotkey - Help needed on this!

Hello,

I would like to add a hotkey to Unreal that is not actually accessible on Vanilla Unreal.
It’s the “Replace selected actor with selection” option you get when right clicking on an asset in level editor.
I have searched the web and found I have to add a line to this file : DefaultEditorPerProjectUserSettings.ini
But my problem is that I don’t know what is that class named.

Can somebody help me with this ?
Thanks a lot !