I recently transitioned to LR from Aperture and pretty much have organized it in a similar fashion... I'm old and adverse to change. Anyway, I have all my images in their various folders and to date have not used catalogs or collections. I have one particular folder of just over 600 images of which about 80 are converted to B&W with individual adjustments. My client is asking to see those 80 in color and I'd like to find a way to be able to compile them all separately and revert to the original settings, without undoing those adjusted B&Ws?