DO NOT PROCEED IF YOU ARE NOT COMFORTABLE WITH MANAGING BACKEND ITEMS ON YOUR SYSTEM
If you, like me have X-Plane on an SSD and your ortho on another drive, then a simple shortcut of your ortho folders dropped into your custom scenery folder is enough. Many people use symbolic links for this, but I have found that a shortcut does the job just as well. And it has no performance impact unless you link to a slower than normal HDD or to a slow remote connection.
To create a shortcut just o