If I understood correctly your first post, you are not going to do any processing and you just want to store the jpegs on a different drive. If this is right, then you don't need to import the images in LR.
If you have the raw and jpegs in a folder, you can order by file type in windows explorer, select the jpegs and copy them to the destination drive / folder
If you still want to import them to LR (for cataloging, slide show, etc) you can uncheck the raw files, but it will be time consuming since the LR import dialog is very limited and does not have an option to sort by file type. Another option is to import everything and then filter by file type in the library, select jpeg, and export them as "Original" to your desired destination