Thanks for your quick response. I was familiar with this process.
I was looking for a quicker way to do the same thing. iPhotoDraw has a tool called the image magnifier that does this with just a couple of clics.
You select the tool, you drag an ellipse around the area you want to magnify, and the tool creates a new layer with a magnified view of the area. You can even modify the focus area and the magnifying value afterwards... I was hoping there would be an equivalent in PdN.