Saleh --
Good question. I am pleased to report that there is DEFINITELY another way to handle this situation. First of all, open your master project Read/Write. Apply the Gantt Chart view and then insert the Marked column. It is a default Flag field in Microsoft Project, which you can use to mark tasks for a specific reason. In the Marked column, select a Yes value for each of the tasks that you want to "call out" in the project. Then hide the Marked column, and create a custom filter called something like Marked Tasks. In the filter, set the filter criteria to Marked = Yes. Also, if you want summary tasks to display automatically when you apply the custom filter, be sure to select the "Show related summary tasks" checkbox as well. Save the filter and then save the project.
Whenever you want to show only the tasks you wish to "call out" in the project, simply apply your custom Marked Tasks filter. How does that sound? Let me know. Thanks!