Why would I need to back annotate a design? If you make changes to your design while in PCB Editor (for example, swapping a footprint), you must back annotate (meaning, push changes) from the PCB design back into your original schematic.
Introduction In order to create a PCB, you must first prepare the schematic and check for errors, export a netlist of the schematic, import the netlist into PCB editor, and design the PCB.