...
Projects are your section-based or stage-based jobs which you can display by ticking the box beside "Projects Only" and clicking on the "Generate Gantt Chart" button.
You can also click on the black triangle beside the parent job to toggle the view such as hiding or showing the section jobs or projects.
Note: Moving or rescheduling the parent job automatically reschedules the job sections with the same duration each.
Rescheduling the parent job automatically reschedules the job sections
How to edit Start/End Dates & Completion Percentage
...