How to create broken-up (or interrupted) task

[groj]

Hi,

I was wondering how to set up an interrupted task. By chance I saw th
tasks as in the attached image in my project plan.

I have also made a screen-shot of the Task Information dialog box i
that is some clue to you.

I have no idea -how- this was created, but think this is a reall
useful way to describe that a task starts as a dependancy before anothe
task and then gets finished after the task that it depends on finishes.
How do I create such a task in MS Project?

Thanks a lot