how to create links project phases together using autoSchedule

Here is what we suppose to create in MS project 2010:

1. make sure you indent all the subtask using: Task tab > schedule section > Green arrow (indent)
2. Choose start date for the first phase, then use autoSchedule under the task tab, then relink all the tasks under the very first phase again to make sure they link correctly
Note: when doing autoSchedule, links will be broken

 Use, Information in Property section to define the duration of the subtasks, this will save a lot of time if setting duration for thousand tasks. Just select all subtaks then change the durations.

Now, it should be OK, the schedule will look correct.