Sorting photos, now have copies of all of my pics?

[gerbil545]

I recently organized all 700 of my photos. I synced it to my phone, and, in addition to all of my folders, I still have the 700 on the camera roll. What I'd like to do is to empty my camera roll and just have the sorted photos. As I take more photos, I'll log on to my computer and remove them from the camera roll and put them in a specific folder.
Basically, how would I empty the actual "Camera Roll" while still having them all sorted in folders? Thanks.

EDIT: Actually, I know that with my camera roll I can delete them all on my phone. But I now see that there is also a "photo library" that has THIRD copies of my photos. Keep in mind that you can't delete photos from albums or a "photo library".