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You can add tasks from Gantt.From Interactive Gantt: 

1. Go to your project. By default, you are taken to the Interactive Gantt. If not, click on the Interactive Gantt link from the left panel of reportsviews.
2. From the Gantt menu bar, Click on the Add, option and then select click on Task. 
3. This will open add a popup window for a new task in your project plan. 
4. Enter your task details and click Save.

You can also add sub-tasks, Milestones, Predecessor, Successor, etc. from here.

To Add Multiple Tasks.:
At times when creating your WBS, it is more convenient to add multiple tasks in one shotgo, and then go back to schedule them. To achieve this

1. Go to the Interactive Gantt view of the project.
2. Click on the Add, then select >  Multiple. 
3. This opens a popup where you can enter task name; one on each line.
4. Upon Submit, multiple tasks are created 

To read about Gantt features, please click here.