> Is there a way to view subgalleries similar to "include child folders"?
I'm afraid not..
> Also, how do I make a copy of all the photos in a gallery to a disk?
Just select all images in the gallery (press Ctrl-A) and use File | Copy.
> So what they do is copy the files into a new folder and subfolders. This makes it nice for them to print, make hard copies, or send to others but it is filling up the server harddrive.
Well, it sounds like they could just create galleries for those photos, instead of copying them to new folders.
To get back to your first question..: if you want to combine multiple galleries, you can create a new gallery, then visit each existing gallery, press Ctrl-A to select its thumbnails, and use 'Thumbnail | Gallery | Add To' to copy them to the newly made gallery.