I recently switched from LR4 on a PC to LR5 on a Mac. I had an old catalog which I brought into 5. An LR instructor set up a new catalog for me on the mac and put the old catalog on my external drive. I was just in Yellowstone, and somehow those photos ended up in my old catalog. I tried moving them to the new catalog using the directions in the manual and succeeded, but the moved photos were stripped of all ratings and editing changes. How do I move photos without losing my editing work?
In one catalog in Lightroom, select File->Import from Another Catalog and point to the other catalog file.