How Can I use an Existing PCB design with a New Schematic

We have completed a Design (Schematic and PCB) and now have a second design.

The schematics have been completed for the second design, but now I want to use the existing PCB from the 1st Design and forward annotate the changes.

How do I achieve this?

The 2 designs are about 90% similar, with the second design having fewer components on it. Board shape and critical component positions are the same between designs.

Using Expedition VX1.1 with DxDesigner.