Sometimes it might seem better to register your time on more than one project at a time. In cases like this, you could merge these projects into one big super project, but that would only make things complicated. It is better to just create separate projects and have them open simultaneously in TimeTraces.
All the projects that are currently open in TimeTraces are listed in alphabetical order under the "Window" menu item. You can also easily cycle through your open projects by pressing the "Ctrl" and "Tab" keys simultaneously (this switches to the next project), or pressing the "Ctrl", "Shift" and "Tab" keys simultaneously (for the previous project). In this way it is easy to start- and stop working on more than one project at a time.