Available with Network Analyst license.
Creating a new field in a turn feature class is the same procedure as creating a new field in any feature class. You might want to add a new field to add a DriveTime attribute to your network that includes the time it takes to make turns.
To add a new field in ArcCatalog or ArcMap, see Adding and deleting fields. Otherwise, use the Add Field tool.
Deleting an existing field on a turn feature class is the same procedure as deleting an existing field in any feature class.
To delete a field in ArcCatalog or ArcMap, see Adding and deleting fields. Otherwise, use the Delete Field tool.