Order Rescheduling through Gantt Chart

Hi All,

I have not use Gantt Chart before and would like to know if anyone can help to understand below.

1) Can we rescheduled all pegged Work Orders to a sales Order by only Drag and drop of Parent work order. I tried to move the Parent Job but it did not moved child Jobs. Below Screen shot for reference.(3001156 is parent Job and 3001154 and 3001155 are child Jobs)

2) Also does system allows to rescheduled only those order where ASCP has suggested a rescheduled action or any order can be rescheduled using gantt chart.

3) Do we always have to save the rescheduled Order on gantt chart and then actual rescheduling will done when we release the order from workbench. is there an option that orders can be directly rescheduled from Gantt chart.