Import tasks from MS-project
You can import your project from three subsections of the Project Management module: from Tasks list, from Projects list or from the Gantt chart, but Gantt chart is not yet available in the new user interface.
Click on the Import button and then MS project file.
Then, you need to choose a file to import and select to which project you want to import your tasks by Select Filedropdown. Note that only .mpp and .xml files exported from MS Project are allowed to be imported. Also, there is a box called Import tasks as billable,which you need to tick, if you need to invoice your customers based on task worked hours
After selecting a project, click on Import and wait until it imports those tasks from MS Project file. The tasks will appear in the Task list.