GanttProject 3.1 is just around the corner, and while we're building all the packages, it is a good moment to look at the new feature.
When you write a project file to GanttProject Cloud, we parse and analyze it, extract the resources and store them in a resource database. We use this database e.g. for building a Resource Capacity Heatmap on GanttProject Cloud, and starting from GP 3.1 it can be used to populate projects in GanttProject Desktop.
Choose "Resources > Add from GanttProject Cloud" from the menu, tick the check boxes next to the people names, hit "Add" and the checked resources will be added to your current project.
This works even if the current project is not yet on the Cloud (and even if it is not planned to be there). You can connect to GanttProject Cloud using a toggle in the status bar. Switch it on to sign in and switch it off to sign out and forget your sign in credentials.