Zoning a Network View
You can use zoning to group activities into horizontal bands based on one or more criteria that you specify.
You use the Zone Attributes dialog box to define how Open Plan displays zones in a network view.
After you define zoning and perform automatic placements, you can treat the zone headers as annotations to the view. In other words, you can edit, reposition, and resize zone headers just as you can for annotations. You can also attach zone headers to activities so that a header moves with the specified activity.