To Create a Gantt View of your project with their tasks :

From the main menu, click Reports > All Reports.
From the New Report drop-down list select a report template (Project or Task).
If you do not wish to see the tasks in the project than, you can create a report of type Project.
In the new pop-up, enter the name of the report in the Name* box.
In the Description box, type the description.
From the Visible to Users drop-down list, select the appropriate option with whom you want to share the report.
From the Visible to Clients drop-down list, select the clients with whom you want to share the report.
In the Filters tab , from the Add filter... drop-down list, select a filter. The selected filters are displayed under the Filter column.

To view tasks if selected projects, select filters like P:Open Projects, Projects.
Select the Prompt? check box if you want to display the selected filters in the report output window.
In the View section, select Gantt
Click Save to save the report.

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