To add a new bay to your current planogram:
The bay is placed at the center of the scene if there is space, otherwise to the right of any existing bay.
Clicking Add several times will create exactly the same bay.
Tip: Just after you have defined and added the desired bays to the viewing area, it can be useful to save the project with the empty bays to be re-used as a template. You can name it for example "Template bays for store X"; then you just need to drag that template from the Template Catalog to start a new project with the same bays.
Tip: this command is also available in the Edit menu and Context menu > Edit.