Change Attributes for Multiple Projects or Tasks
When you select multiple projects or tasks and click Change Attributes, the attributes defined in appear in the dialog box. The system project attributes also are available to change if you have defined them, such as Due Date, Cost Model, Client and Quality Model.
Use Change Attributes to change particular attributes across multiple projects or tasks, leaving all others unchanged.
Choosing Select All will modify all attributes for all selected projects. Only do this if you want to change all attributes for all projects.
Modify the attributes as needed and click OK.
The modified attributes appear in the project or task list, if the view is configured to show them.