Click on the SubProjects tab to create new SubProjects, or view them for existing Projects. Click on the blue add button in the upper right to bring up a form similar to the new Project form and fill in the information for your new SubProject. Click SAVE and you'll be taken to the SubProject page. On the left side of the blue page header, you'll see the Parent Project name. Click the name to be taken back to the Parent Project page and then enter any remaining SubProjects.