Organizing pictures on Skydrive + Windows Phone

So it looks like I filled up my Lumia 900. I have about 400 pictures in my "camera roll" folder. Most of these have been uploaded to skydrive but in Skydrive they are just in one big folder. So if I want to look at these on my phone, it takes forever to load the thumbnails. Attempting to organize them now, but I can't seem to find out how to multi select pictures and move a bunch at once. Is the feature there? Also, anyone know how to multi delete from Windows Phone instead of one at a time?