If you have a project started already, with all your images loaded, you can choose to add as many sub-projects as you want. Since all the images are already loaded, this saves you from having to import your photos every time you start a new sub-project from the same set of images.
Add New Item
Click on the project with the images you want to use for your Image Brander sub-project. Then you'll click on "Add New Item" to bring up the project modules.
Once you click "Add New Item", a list of available modules will display where you can click on Image Brander to create your sub-project.