You can duplicate an album, or sub-project, at any time so you can easily make changes and not effect your parent project.
When you click on the Album Builder icon, you will be give a list of your Sub-Projects. To duplicate an Album Builder project, click on the two squares to the right of the project name.
Change the Album Name
Once you have copied the album, go into your album settings menu. You find this by clicking on the current size.