First, sheet metal is not my everyday tool. In recent weeks though, I have needed to create several sheet metal models. I have found myself creating this specific sort of tab several times but I can't seem to find a way that is robust. My current method starts with a cutout notch to the distance back from the edge where I want the tab to be and then creating an edge flange using a sketch to the width that I need with the relief. If the thickness of the metal ever changes then this will require manual updates to fix it.