If you’d like to combine multiple elements together in a project, be sure to check out layers. You can access controls for layers by clicking the Layers button in the Edit sidebar.
Each layer can contain discrete elements of your project. Layers can contain photos, textures, ore adjustments. There are lots of ways to create and manage layers, but it all comes back to having an organized design. Be sure to click the action menu of each layer and choose the rename option to give it a clear, descriptive name to make your workflow easier.