Splitting a task which have sub tasks

Question

There's a task which have 1 sub-task; there's no data for the duration of sub-task. but it's definite that the TASK itself is split. I can't show the split in gantt chart. 

In the image attached, I want to have the graphical shape of the picture above (1), while "B" is a sub-task of "A". but what I got is the one in the bottom (2).

Answer 1

Task B has two parts, so make it two tasks, B1 and B2. If there is no "data", then estimate start date and duration of each part. In task information, check the rollup box.

You can't make A look the same in both situations because in 1 A is a task while in 2 A is a summary, not a task.

Answer 2

A summary task (Task A in part 2) doesn't show a split like a "normal" task.  If you change task A to be autoscheduled, then its duration (and bar) will only be as long as its subtask.  Usually if a summary task has only one subtask - you can just eliminate one and go with one task.