Hi shanigarbacz

Check out this featured question:

https://www.houzz.com/discussions/how-do-i-create-a-new-ideabook-dsvw-vd~31916

You will need to create new ideabooks for the categories that you want and then delete those photos from your existing ideabooks. In the future, when you want to add a photo to an ideabook, you can choose from your existing categories. It's a bit of a pain at first, but worth it in the long run.

How can I move photos from one ideabook to another? (so that I can create categories)

Click on the photo and add it to another ideabook while simultaneously creating an additional ideabook. You can add the same photo to multiple ideabooks. After you add it to your new ideabook, you will need to then delete it from the first ideabook. It's a multi-step process, that results in moving the photo from one ideabook to the other by actually adding it to both and then deleting it from the first.