Data Type Yes/No (Yes/No field: A type of field with content set to either Yes or No; also known as a Boolean field or a True/False field. For example, the Recurring field indicates whether the task is a recurring task.)
Entry Type Entered (entered field: A field in which you may type or edit information. This is in contrast with a calculated field, in which Project calculates and enters information.)
Description The Hide Bar field indicates whether the Gantt bars and Calendar bars for a task are hidden. Click Yes in the Hide Bar field to hide the bar for the task. Click No in the Hide Bar field to show the bar for the task.
Best Uses Add the Hide Bar field to a task sheet when you want to specify in that sheet that the Gantt bar and Calendar bar for a particular task are to be hidden on the Gantt Chart and Calendar views.
Example You want to roll up milestone tasks to a new summary task, and you don't want the summary task bar to appear on the Gantt Chart because it will distract from the milestone symbols that are being rolled up. You add the milestone tasks to the summary task, and you use the Hide Bar field to turn off the summary task bar.
Remarks You can also set the Hide Bar field in the Task Information dialog box. By default, the Gantt bar and Calendar bar are shown for all tasks.