I have classified more than 100000 old pictures and scans in a catalogue.
I would like to divide them in more than a catalogue saving the classifications.
I am not able to find out the way for having it done.
There is no direct way of doing this.
What you can do is, create copies of your catalog folder on HDD (catalog folder location can be found by Help->System Info). Suppose you want have images of two classification (say A and B_. Rename each copy as per the images which it should contain( that is A or B). Now open catalog A and remove the images belonging to B (note that while deleting there is an option which says 'delete from HDD', make sure that this option remains "UN-checked"). Do similar with catalog B that is remove images belonging to classification A).