Cloning or duplicating feature within feature class using ArcMap

There are a few ways to do this. Within an active editing session you can simply use the Copy and Paste tools on the main tool bar. I dialogue window will pop-up asking you which layer you want to paste it into. A second option is to use the Copy Features Tool that is part of the Advanced Editing Toolbar. This tool will also pop-up a window asking you which layer you would like to save the feature to (assuming you may have multiple layers loaded in ArcMap).

Surely it would be better to create an "Owner Table" and relate the feature class to the owner table. Good GIS practice !

OR a less pretty way would be to have multiple fields in the feature class e.g. Owner1, Owner2 etc.