Assign a photo to multiple category
 

I know there is a way to upload a photo to multiple categories. Is there a quick way to assign multiple categories to multiple photos together, like bulk way??

In Admin => Upload Options set yes to the option to assign to optional categories

That is how you do it and those boxes appear on bulk upload

yeah Chuck, but what about after the photos already exists in the system. is there a way to assign mutiple categories to them from the admin interface or I have to visit each photo page and select "edit photo" and then "copy photo to" option?

If you edit a photo and that option is turned on there are cat boxes to copy the photo to other categories