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1. Go to the Gantt of your project.
2. Select a task and from the right-click actions drop-down list, click on (s) and press Ctrl+C on the keyboard OR right-click on the task and select Copy.
3. Now, select the task , under which you want to paste the task and press Ctrl+V on the keyboard  OR  right-click on the task and select Paste.  The The new task(s) is now seen under the task. 
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To Move a task to another project :

1. Go to the Gantt of your project.
2. Select Right-click on the task you want to copy to another project.
3. From the Gantt menu bar, click on More.
4. Click on wish to move and click on Move.
5. On Now, in the new pop-up window, select the appropriate option  to select pick the project where the task will be moved and click on Next.
   

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1. The task will move to the selected project.

Moving the task will move the costs, documents, updates made on the task to the new selected project.