I've set up a number of projects but I'd now like to make them sub-projects under a 'master' project? I can't see any way to do this though. Thanks!
To do so, please right-click on the top project, choose "Add project above", add the parent project and then right-click on each of the existing projects, choose "Edit" and then either use the arrow icons on the right side of the project name input field to indent each of them or the keyboard shortcut Ctrl+RightArrow.
Unfortunately, it's not possible to indent all of them at once so you'll need to do it one-by-one.