Hi there,

Yes there is! If they go into the ideabook the want to move photos from (probably the one with less images) they can click on "Edit" in the bar along the top of the Ideabook. They then can select all of their images in the Ideabook by clicking-and-highlighting them. The should then see a "move photos to" and "copy photos to" button at the top of the page.

Hopefully this helps,

Jake from Houzz