Gantt chart with multiple start dates duration per task

This is exactly what we need. Using a Gantt Chart to display flights of media buying activity over time, per channel. So each line is the type of media bought, and each flight has it's own start and end date. This shouldn't be that hard, for each "resource" that has a line, having the ability to add any number of start and end date periods along that line. Would also be useful for repetitive tasks that have to be done by people, and saves space rather than having a new line for each time.

Please can any one explain the steps to have multiple start dates for certain task activity for gantt chart in power Bi