Made an import error

Yesterday I imported some photos that I took this past weekend. I wasn't paying attention and somehow the option for only adding to the catalog was selected and not "copy dng to drive". I worked on some of the photos I imported until I had to leave for work. I removed my card from my card reader and got a notification that the photo I was currently working on was not available. After some rooting around and thinking about what was going on, I noticed the selection error made on importing. Is there a way to import these photos onto my drive without deleting them from the catalog so I don't lose the edits that are already performed? If not, how do I go about deleting them from the catalog (it won't even give me the option to import duplicates) so that I can import them correctly?

Thanks in advance for the help!