There are a couple of different ways to open up projects in Fundy Designer.
The drop down file menu will provide options to Open or Open Recent projects.
"Open" will bring up the finder window to locate past projects.
"Open Recent" will open a list of recently opened projects.
Or locate the project where it has been saved locally, and right click to open it in Fundy Designer
Once a project has been opened in Fundy Designer, clicking on the module icons will drop down a list of all the sub-projects within that parent project.